42931239 has 36 divisors (see below), whose sum is σ = 66068856. Its totient is φ = 24780288.

The previous prime is 42931201. The next prime is 42931253. The reversal of 42931239 is 93213924.

It is not a de Polignac number, because 42931239 - 2¹³ = 42923047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42931439) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 146377 + ... + 146669.

It is an arithmetic number, because the mean of its divisors is an integer number (1835246).

Almost surely, 2^42931239 is an apocalyptic number.

42931239 is a deficient number, since it is larger than the sum of its proper divisors (23137617).

42931239 is a wasteful number, since it uses less digits than its factorization.

42931239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 326 counting only the distinct ones).

The product of its digits is 11664, while the sum is 33.

The square root of 42931239 is about 6552.1934495251. The cubic root of 42931239 is about 350.1529644310.

The spelling of 42931239 in words is "forty-two million, nine hundred thirty-one thousand, two hundred thirty-nine".