1390639941 has 8 divisors (see below), whose sum is σ = 2060207360. Its totient is φ = 927093276.

The previous prime is 1390639919. The next prime is 1390639951. The reversal of 1390639941 is 1499360931.

1390639941 is a `hidden beast` number, since 1 + 3 + 9 + 0 + 639 + 9 + 4 + 1 = 666.

It is not a de Polignac number, because 1390639941 - 2¹⁰ = 1390638917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390639951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25752565 + ... + 25752618.

It is an arithmetic number, because the mean of its divisors is an integer number (257525920).

Almost surely, 2^1390639941 is an apocalyptic number.

It is an amenable number.

1390639941 is a deficient number, since it is larger than the sum of its proper divisors (669567419).

1390639941 is an equidigital number, since it uses as much as digits as its factorization.

1390639941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51505192 (or 51505186 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 1390639941 is about 37291.2850542858. The cubic root of 1390639941 is about 1116.1902713504.

The spelling of 1390639941 in words is "one billion, three hundred ninety million, six hundred thirty-nine thousand, nine hundred forty-one".