42399139 has 16 divisors (see below), whose sum is σ = 45964800. Its totient is φ = 38966400.

The previous prime is 42399113. The next prime is 42399157. The reversal of 42399139 is 93199324.

42399139 = 107² + 108² + ... + 504².

It is a cyclic number.

It is not a de Polignac number, because 42399139 - 2⁵ = 42399107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42399179) 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, 212962 + ... + 213160.

It is an arithmetic number, because the mean of its divisors is an integer number (2872800).

Almost surely, 2^42399139 is an apocalyptic number.

42399139 is a deficient number, since it is larger than the sum of its proper divisors (3565661).

42399139 is a wasteful number, since it uses less digits than its factorization.

42399139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450.

The product of its digits is 52488, while the sum is 40.

The square root of 42399139 is about 6511.4621245923. The cubic root of 42399139 is about 348.7003199147.

The spelling of 42399139 in words is "forty-two million, three hundred ninety-nine thousand, one hundred thirty-nine".