42510399 has 16 divisors (see below), whose sum is σ = 59167584. Its totient is φ = 27123200.

The previous prime is 42510397. The next prime is 42510407. The reversal of 42510399 is 99301524.

It is a Cunningham number, because it is equal to 6520²-1.

It is a cyclic number.

It is not a de Polignac number, because 42510399 - 2¹ = 42510397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42510397) 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, 3259 + ... + 9779.

It is an arithmetic number, because the mean of its divisors is an integer number (3697974).

Almost surely, 2^42510399 is an apocalyptic number.

42510399 is a deficient number, since it is larger than the sum of its proper divisors (16657185).

42510399 is a wasteful number, since it uses less digits than its factorization.

42510399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6618.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 42510399 is about 6519.9999233129. Note that the first 4 decimals coincide. The cubic root of 42510399 is about 349.0050628297.

The spelling of 42510399 in words is "forty-two million, five hundred ten thousand, three hundred ninety-nine".