2157625 has 16 divisors (see below), whose sum is σ = 2764944. Its totient is φ = 1680000.

The previous prime is 2157587. The next prime is 2157641. The reversal of 2157625 is 5267512.

It can be written as a sum of positive squares in 8 ways, for example, as 1937664 + 219961 = 1392^2 + 469^2 .

It is not a de Polignac number, because 2157625 - 2¹⁹ = 1633337 is a prime.

It is a Duffinian number.

2157625 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2157593 and 2157602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4915 + ... + 5335.

It is an arithmetic number, because the mean of its divisors is an integer number (172809).

2^2157625 is an apocalyptic number.

2157625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2157625 is a deficient number, since it is larger than the sum of its proper divisors (607319).

2157625 is an equidigital number, since it uses as much as digits as its factorization.

2157625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 467 counting only the distinct ones).

The product of its digits is 4200, while the sum is 28.

The square root of 2157625 is about 1468.8856320354. The cubic root of 2157625 is about 129.2186864121.

The spelling of 2157625 in words is "two million, one hundred fifty-seven thousand, six hundred twenty-five".