42072931 has 2 divisors, whose sum is σ = 42072932. Its totient is φ = 42072930.

The previous prime is 42072923. The next prime is 42073027. The reversal of 42072931 is 13927024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42072931 - 2³ = 42072923 is a prime.

It is a super-2 number, since 2×42072931² = 3540263045861522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42072931.

It is not a weakly prime, because it can be changed into another prime (42072031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21036465 + 21036466.

It is an arithmetic number, because the mean of its divisors is an integer number (21036466).

Almost surely, 2^42072931 is an apocalyptic number.

42072931 is a deficient number, since it is larger than the sum of its proper divisors (1).

42072931 is an equidigital number, since it uses as much as digits as its factorization.

42072931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 42072931 is about 6486.3650066890. The cubic root of 42072931 is about 347.8037466351.

Adding to 42072931 its reverse (13927024), we get a palindrome (55999955).

The spelling of 42072931 in words is "forty-two million, seventy-two thousand, nine hundred thirty-one".