1439424021 has 32 divisors (see below), whose sum is σ = 2358005760. Its totient is φ = 762647616.

The previous prime is 1439423989. The next prime is 1439424029. The reversal of 1439424021 is 1204249341.

It is not a de Polignac number, because 1439424021 - 2⁵ = 1439423989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1439424021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1439424029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19626 + ... + 57131.

It is an arithmetic number, because the mean of its divisors is an integer number (73687680).

Almost surely, 2^1439424021 is an apocalyptic number.

It is an amenable number.

1439424021 is a deficient number, since it is larger than the sum of its proper divisors (918581739).

1439424021 is a wasteful number, since it uses less digits than its factorization.

1439424021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76833.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1439424021 is about 37939.7419732923. The cubic root of 1439424021 is about 1129.0926543036.

The spelling of 1439424021 in words is "one billion, four hundred thirty-nine million, four hundred twenty-four thousand, twenty-one".