1390400905 has 16 divisors (see below), whose sum is σ = 1757448000. Its totient is φ = 1053086400.

The previous prime is 1390400873. The next prime is 1390400909. The reversal of 1390400905 is 5090040931.

It is not a de Polignac number, because 1390400905 - 2⁵ = 1390400873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1390400909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176746 + ... + 184444.

It is an arithmetic number, because the mean of its divisors is an integer number (109840500).

Almost surely, 2^1390400905 is an apocalyptic number.

It is an amenable number.

1390400905 is a deficient number, since it is larger than the sum of its proper divisors (367047095).

1390400905 is a wasteful number, since it uses less digits than its factorization.

1390400905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9624.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 1390400905 is about 37288.0799317959. The cubic root of 1390400905 is about 1116.1263139979.

The spelling of 1390400905 in words is "one billion, three hundred ninety million, four hundred thousand, nine hundred five".