1391992655 has 16 divisors (see below), whose sum is σ = 1708470144. Its totient is φ = 1088279040.

The previous prime is 1391992633. The next prime is 1391992661. The reversal of 1391992655 is 5562991931.

It is not a de Polignac number, because 1391992655 - 2¹⁰ = 1391991631 is a prime.

It is a Duffinian 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, 168215 + ... + 176295.

It is an arithmetic number, because the mean of its divisors is an integer number (106779384).

Almost surely, 2^1391992655 is an apocalyptic number.

1391992655 is a deficient number, since it is larger than the sum of its proper divisors (316477489).

1391992655 is an equidigital number, since it uses as much as digits as its factorization.

1391992655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8866.

The product of its digits is 656100, while the sum is 50.

The square root of 1391992655 is about 37309.4177788933. The cubic root of 1391992655 is about 1116.5520704658.

The spelling of 1391992655 in words is "one billion, three hundred ninety-one million, nine hundred ninety-two thousand, six hundred fifty-five".