1390042931 has 2 divisors, whose sum is σ = 1390042932. Its totient is φ = 1390042930.

The previous prime is 1390042921. The next prime is 1390042949. The reversal of 1390042931 is 1392400931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1390042931 - 2³⁰ = 316301107 is a prime.

It is a super-2 number, since 2×1390042931² = 3864438700046141522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1390042921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695021465 + 695021466.

It is an arithmetic number, because the mean of its divisors is an integer number (695021466).

Almost surely, 2^1390042931 is an apocalyptic number.

1390042931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390042931 is an equidigital number, since it uses as much as digits as its factorization.

1390042931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 1390042931 is about 37283.2795097212. The cubic root of 1390042931 is about 1116.0305194460.

The spelling of 1390042931 in words is "one billion, three hundred ninety million, forty-two thousand, nine hundred thirty-one".