42520491 has 48 divisors (see below), whose sum is σ = 71226400. Its totient is φ = 24919488.

The previous prime is 42520487. The next prime is 42520501. The reversal of 42520491 is 19402524.

It is not a de Polignac number, because 42520491 - 2² = 42520487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42520441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 185565 + ... + 185793.

Almost surely, 2^42520491 is an apocalyptic number.

42520491 is a deficient number, since it is larger than the sum of its proper divisors (28705909).

42520491 is a wasteful number, since it uses less digits than its factorization.

42520491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 42520491 is about 6520.7738037751. The cubic root of 42520491 is about 349.0326786640.

The spelling of 42520491 in words is "forty-two million, five hundred twenty thousand, four hundred ninety-one".