1390831 has 8 divisors (see below), whose sum is σ = 1517040. Its totient is φ = 1267392.

The previous prime is 1390813. The next prime is 1390841. The reversal of 1390831 is 1380931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1390831 - 2⁷ = 1390703 is a prime.

It is a super-2 number, since 2×1390831² = 3868821741122, which contains 22 as substring.

It is a Duffinian number.

1390831 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1390796 and 1390805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435 + ... + 1723.

It is an arithmetic number, because the mean of its divisors is an integer number (189630).

2^1390831 is an apocalyptic number.

1390831 is a deficient number, since it is larger than the sum of its proper divisors (126209).

1390831 is a wasteful number, since it uses less digits than its factorization.

1390831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1390831 is about 1179.3349820980. The cubic root of 1390831 is about 111.6241386530.

The spelling of 1390831 in words is "one million, three hundred ninety thousand, eight hundred thirty-one".