2157907925 has 12 divisors (see below), whose sum is σ = 2702302116. Its totient is φ = 1709232000.

The previous prime is 2157907907. The next prime is 2157907943. The reversal of 2157907925 is 5297097512.

It is a happy number.

2157907925 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2157907907) and next prime (2157907943).

It can be written as a sum of positive squares in 6 ways, for example, as 518791729 + 1639116196 = 22777^2 + 40486^2 .

It is not a de Polignac number, because 2157907925 - 2⁸ = 2157907669 is a prime.

It is a super-2 number, since 2×2157907925² = 9313133225555611250, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2157907925.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 424784 + ... + 429833.

It is an arithmetic number, because the mean of its divisors is an integer number (225191843).

Almost surely, 2^2157907925 is an apocalyptic number.

2157907925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2157907925 is a deficient number, since it is larger than the sum of its proper divisors (544394191).

2157907925 is a wasteful number, since it uses less digits than its factorization.

2157907925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854728 (or 854723 counting only the distinct ones).

The product of its (nonzero) digits is 396900, while the sum is 47.

The square root of 2157907925 is about 46453.2875585787. The cubic root of 2157907925 is about 1292.2433422687.

The spelling of 2157907925 in words is "two billion, one hundred fifty-seven million, nine hundred seven thousand, nine hundred twenty-five".