1392640443 has 12 divisors (see below), whose sum is σ = 2031123120. Its totient is φ = 919412496.

The previous prime is 1392640439. The next prime is 1392640499. The reversal of 1392640443 is 3440462931.

It is a happy number.

1392640443 is a `hidden beast` number, since 1 + 3 + 9 + 2 + 640 + 4 + 4 + 3 = 666.

It is not a de Polignac number, because 1392640443 - 2² = 1392640439 is a prime.

It is a super-3 number, since 3×1392640443³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1392640398 and 1392640407.

It is not an unprimeable number, because it can be changed into a prime (1392640423) 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, 750228 + ... + 752081.

It is an arithmetic number, because the mean of its divisors is an integer number (169260260).

Almost surely, 2^1392640443 is an apocalyptic number.

1392640443 is a deficient number, since it is larger than the sum of its proper divisors (638482677).

1392640443 is a wasteful number, since it uses less digits than its factorization.

1392640443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502418 (or 1502415 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 1392640443 is about 37318.0980624683. The cubic root of 1392640443 is about 1116.7252459158.

The spelling of 1392640443 in words is "one billion, three hundred ninety-two million, six hundred forty thousand, four hundred forty-three".