42520390 has 16 divisors (see below), whose sum is σ = 83494800. Its totient is φ = 15461920.

The previous prime is 42520381. The next prime is 42520391. The reversal of 42520390 is 9302524.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42520391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193165 + ... + 193384.

It is an arithmetic number, because the mean of its divisors is an integer number (5218425).

Almost surely, 2^42520390 is an apocalyptic number.

42520390 is a deficient number, since it is larger than the sum of its proper divisors (40974410).

42520390 is a wasteful number, since it uses less digits than its factorization.

42520390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386567.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 42520390 is about 6520.7660592909. The cubic root of 42520390 is about 349.0324023084.

The spelling of 42520390 in words is "forty-two million, five hundred twenty thousand, three hundred ninety".