1393257489 has 8 divisors (see below), whose sum is σ = 2000574912. Its totient is φ = 857389200.

The previous prime is 1393257427. The next prime is 1393257497. The reversal of 1393257489 is 9847523931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1393257489 - 2¹⁶ = 1393191953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1393257589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17862237 + ... + 17862314.

It is an arithmetic number, because the mean of its divisors is an integer number (250071864).

Almost surely, 2^1393257489 is an apocalyptic number.

It is an amenable number.

1393257489 is a deficient number, since it is larger than the sum of its proper divisors (607317423).

1393257489 is a wasteful number, since it uses less digits than its factorization.

1393257489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35724567.

The product of its digits is 1632960, while the sum is 51.

The square root of 1393257489 is about 37326.3645296458. The cubic root of 1393257489 is about 1116.8901530662.

It can be divided in two parts, 139 and 3257489, that added together give a triangular number (3257628 = T₂₅₅₂).

The spelling of 1393257489 in words is "one billion, three hundred ninety-three million, two hundred fifty-seven thousand, four hundred eighty-nine".