1399362640 has 40 divisors (see below), whose sum is σ = 3503791368. Its totient is φ = 516687360.

The previous prime is 1399362617. The next prime is 1399362659. The reversal of 1399362640 is 462639931.

It can be written as a sum of positive squares in 4 ways, for example, as 69155856 + 1330206784 = 8316^2 + 36472^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671731 + ... + 673810.

Almost surely, 2^1399362640 is an apocalyptic number.

1399362640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399362640 is an abundant number, since it is smaller than the sum of its proper divisors (2104428728).

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

1399362640 is a wasteful number, since it uses less digits than its factorization.

1399362640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345567 (or 1345561 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 1399362640 is about 37408.0558168959. The cubic root of 1399362640 is about 1118.5191526023.

The spelling of 1399362640 in words is "one billion, three hundred ninety-nine million, three hundred sixty-two thousand, six hundred forty".