1391492258 has 18 divisors (see below), whose sum is σ = 2261260179. Its totient is φ = 641910672.

The previous prime is 1391492233. The next prime is 1391492269. The reversal of 1391492258 is 8522941931.

It can be written as a sum of positive squares in 5 ways, for example, as 1095411409 + 296080849 = 33097^2 + 17207^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=26377.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 684788 + ... + 686816.

Almost surely, 2^1391492258 is an apocalyptic number.

1391492258 is a deficient number, since it is larger than the sum of its proper divisors (869767921).

1391492258 is an frugal number, since it uses more digits than its factorization.

1391492258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4086 (or 2044 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 1391492258 is about 37302.7111347151. The cubic root of 1391492258 is about 1116.4182607871.

The spelling of 1391492258 in words is "one billion, three hundred ninety-one million, four hundred ninety-two thousand, two hundred fifty-eight".