421657625 has 16 divisors (see below), whose sum is σ = 526960512. Its totient is φ = 336857200.

The previous prime is 421657603. The next prime is 421657627. The reversal of 421657625 is 526756124.

It is a de Polignac number, because none of the positive numbers 2^k-421657625 is a prime.

It is a super-4 number, since 4×421657625⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421657627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108974 + ... + 112776.

It is an arithmetic number, because the mean of its divisors is an integer number (32935032).

Almost surely, 2^421657625 is an apocalyptic number.

It is an amenable number.

421657625 is a deficient number, since it is larger than the sum of its proper divisors (105302887).

421657625 is an equidigital number, since it uses as much as digits as its factorization.

421657625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4705 (or 4695 counting only the distinct ones).

The product of its digits is 100800, while the sum is 38.

The square root of 421657625 is about 20534.3036161444. The cubic root of 421657625 is about 749.8711630545.

The spelling of 421657625 in words is "four hundred twenty-one million, six hundred fifty-seven thousand, six hundred twenty-five".