1439874640 has 20 divisors (see below), whose sum is σ = 3347708724. Its totient is φ = 575949824.

The previous prime is 1439874637. The next prime is 1439874641. The reversal of 1439874640 is 464789341.

It can be written as a sum of positive squares in 2 ways, for example, as 293916736 + 1145957904 = 17144^2 + 33852^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1439874641) 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, 8999137 + ... + 8999296.

Almost surely, 2^1439874640 is an apocalyptic number.

1439874640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1439874640 is an abundant number, since it is smaller than the sum of its proper divisors (1907834084).

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

1439874640 is a wasteful number, since it uses less digits than its factorization.

1439874640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17998446 (or 17998440 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 1439874640 is about 37945.6801230390. The cubic root of 1439874640 is about 1129.2104647406.

The spelling of 1439874640 in words is "one billion, four hundred thirty-nine million, eight hundred seventy-four thousand, six hundred forty".