921403625 has 16 divisors (see below), whose sum is σ = 1153261200. Its totient is φ = 734976000.

The previous prime is 921403601. The next prime is 921403663. The reversal of 921403625 is 526304129.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 116035984 + 805367641 = 10772^2 + 28379^2 .

It is not a de Polignac number, because 921403625 - 2¹² = 921399529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 921403591 and 921403600.

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, 33065 + ... + 54185.

It is an arithmetic number, because the mean of its divisors is an integer number (72078825).

Almost surely, 2^921403625 is an apocalyptic number.

It is an amenable number.

921403625 is a deficient number, since it is larger than the sum of its proper divisors (231857575).

921403625 is a wasteful number, since it uses less digits than its factorization.

921403625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21485 (or 21475 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 921403625 is about 30354.6310305363. The cubic root of 921403625 is about 973.0831944503.

The spelling of 921403625 in words is "nine hundred twenty-one million, four hundred three thousand, six hundred twenty-five".