42643425 has 72 divisors (see below), whose sum is σ = 80217088. Its totient is φ = 19958400.

The previous prime is 42643421. The next prime is 42643451. The reversal of 42643425 is 52434624.

It is not a de Polignac number, because 42643425 - 2² = 42643421 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42643392 and 42643401.

It is not an unprimeable number, because it can be changed into a prime (42643421) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 335712 + ... + 335838.

Almost surely, 2^42643425 is an apocalyptic number.

It is an amenable number.

42643425 is a deficient number, since it is larger than the sum of its proper divisors (37573663).

42643425 is a wasteful number, since it uses less digits than its factorization.

42643425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 183 counting only the distinct ones).

The product of its digits is 23040, while the sum is 30.

The square root of 42643425 is about 6530.1933355759. The cubic root of 42643425 is about 349.3687260392.

The spelling of 42643425 in words is "forty-two million, six hundred forty-three thousand, four hundred twenty-five".