1392406399 has 4 divisors (see below), whose sum is σ = 1392508264. Its totient is φ = 1392304536.

The previous prime is 1392406397. The next prime is 1392406409. The reversal of 1392406399 is 9936042931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9936042931 = 51929 ⋅191339.

It is a cyclic number.

It is not a de Polignac number, because 1392406399 - 2¹ = 1392406397 is a prime.

It is a super-2 number, since 2×1392406399² = 3877591159952294402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392406397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26532 + ... + 59065.

It is an arithmetic number, because the mean of its divisors is an integer number (348127066).

Almost surely, 2^1392406399 is an apocalyptic number.

1392406399 is a deficient number, since it is larger than the sum of its proper divisors (101865).

1392406399 is an equidigital number, since it uses as much as digits as its factorization.

1392406399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101864.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 1392406399 is about 37314.9621331712. The cubic root of 1392406399 is about 1116.6626843055.

The spelling of 1392406399 in words is "one billion, three hundred ninety-two million, four hundred six thousand, three hundred ninety-nine".