1390881831 has 4 divisors (see below), whose sum is σ = 1854509112. Its totient is φ = 927254552.

The previous prime is 1390881803. The next prime is 1390881851. The reversal of 1390881831 is 1381880931.

1390881831 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1390881831 - 2¹³ = 1390873639 is a prime.

It is a super-2 number, since 2×1390881831² = 3869104535611825122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390881851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231813636 + ... + 231813641.

It is an arithmetic number, because the mean of its divisors is an integer number (463627278).

Almost surely, 2^1390881831 is an apocalyptic number.

1390881831 is a deficient number, since it is larger than the sum of its proper divisors (463627281).

1390881831 is an equidigital number, since it uses as much as digits as its factorization.

1390881831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463627280.

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1390881831 is about 37294.5281643300. The cubic root of 1390881831 is about 1116.2549848691.

The spelling of 1390881831 in words is "one billion, three hundred ninety million, eight hundred eighty-one thousand, eight hundred thirty-one".