1399139390 has 32 divisors (see below), whose sum is σ = 2749407840. Its totient is φ = 508406400.

The previous prime is 1399139377. The next prime is 1399139431. The reversal of 1399139390 is 939319931.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179780 + ... + 187400.

It is an arithmetic number, because the mean of its divisors is an integer number (85918995).

Almost surely, 2^1399139390 is an apocalyptic number.

1399139390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1399139390 is a deficient number, since it is larger than the sum of its proper divisors (1350268450).

1399139390 is a wasteful number, since it uses less digits than its factorization.

1399139390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9308.

The product of its (nonzero) digits is 177147, while the sum is 47.

The square root of 1399139390 is about 37405.0717149426. The cubic root of 1399139390 is about 1118.4596677402.

The spelling of 1399139390 in words is "one billion, three hundred ninety-nine million, one hundred thirty-nine thousand, three hundred ninety".