1392630640 has 20 divisors (see below), whose sum is σ = 3237866424. Its totient is φ = 557052224.

The previous prime is 1392630571. The next prime is 1392630643. The reversal of 1392630640 is 460362931.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1392630596 and 1392630605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392630643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8703862 + ... + 8704021.

Almost surely, 2^1392630640 is an apocalyptic number.

1392630640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1392630640 is an abundant number, since it is smaller than the sum of its proper divisors (1845235784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1392630640 is a wasteful number, since it uses less digits than its factorization.

1392630640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17407896 (or 17407890 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 1392630640 is about 37317.9667184588. The cubic root of 1392630640 is about 1116.7226256455.

The spelling of 1392630640 in words is "one billion, three hundred ninety-two million, six hundred thirty thousand, six hundred forty".