1390368309 has 16 divisors (see below), whose sum is σ = 2028956160. Its totient is φ = 839896560.

The previous prime is 1390368289. The next prime is 1390368311. The reversal of 1390368309 is 9038630931.

It is not a de Polignac number, because 1390368309 - 2¹⁹ = 1389844021 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390368209) 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, 58489 + ... + 78750.

It is an arithmetic number, because the mean of its divisors is an integer number (126809760).

Almost surely, 2^1390368309 is an apocalyptic number.

It is an amenable number.

1390368309 is a deficient number, since it is larger than the sum of its proper divisors (638587851).

1390368309 is a wasteful number, since it uses less digits than its factorization.

1390368309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137560.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 1390368309 is about 37287.6428458544. The cubic root of 1390368309 is about 1116.1175919242.

The spelling of 1390368309 in words is "one billion, three hundred ninety million, three hundred sixty-eight thousand, three hundred nine".