1390075091 has 4 divisors (see below), whose sum is σ = 1471844232. Its totient is φ = 1308305952.

The previous prime is 1390075079. The next prime is 1390075097. The reversal of 1390075091 is 1905700931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1390075091 - 2¹⁴ = 1390058707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390075097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40884545 + ... + 40884578.

It is an arithmetic number, because the mean of its divisors is an integer number (367961058).

Almost surely, 2^1390075091 is an apocalyptic number.

1390075091 is a deficient number, since it is larger than the sum of its proper divisors (81769141).

1390075091 is an equidigital number, since it uses as much as digits as its factorization.

1390075091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81769140.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 1390075091 is about 37283.7107997581. The cubic root of 1390075091 is about 1116.0391261981.

The spelling of 1390075091 in words is "one billion, three hundred ninety million, seventy-five thousand, ninety-one".