1391400279 has 12 divisors (see below), whose sum is σ = 2032383600. Its totient is φ = 917177184.

The previous prime is 1391400271. The next prime is 1391400289. The reversal of 1391400279 is 9720041931.

It is not a de Polignac number, because 1391400279 - 2³ = 1391400271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391400271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 867739 + ... + 869340.

It is an arithmetic number, because the mean of its divisors is an integer number (169365300).

Almost surely, 2^1391400279 is an apocalyptic number.

1391400279 is a deficient number, since it is larger than the sum of its proper divisors (640983321).

1391400279 is a wasteful number, since it uses less digits than its factorization.

1391400279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737174 (or 1737171 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 1391400279 is about 37301.4782414853. The cubic root of 1391400279 is about 1116.3936614653.

The spelling of 1391400279 in words is "one billion, three hundred ninety-one million, four hundred thousand, two hundred seventy-nine".