1872207645 has 64 divisors (see below), whose sum is σ = 3855237120. Its totient is φ = 752947200.

The previous prime is 1872207643. The next prime is 1872207661. The reversal of 1872207645 is 5467022781.

It is not a de Polignac number, because 1872207645 - 2¹ = 1872207643 is a prime.

It is a super-2 number, since 2×1872207645² = 7010322931992892050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1872207597 and 1872207606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1872207643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9661 + ... + 61949.

It is an arithmetic number, because the mean of its divisors is an integer number (60238080).

Almost surely, 2^1872207645 is an apocalyptic number.

1872207645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1872207645 is an abundant number, since it is smaller than the sum of its proper divisors (1983029475).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1872207645 is a wasteful number, since it uses less digits than its factorization.

1872207645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52346.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 1872207645 is about 43269.0148374099. The cubic root of 1872207645 is about 1232.4935961826.

The spelling of 1872207645 in words is "one billion, eight hundred seventy-two million, two hundred seven thousand, six hundred forty-five".