1393257487 has 4 divisors (see below), whose sum is σ = 1412343280. Its totient is φ = 1374171696.

The previous prime is 1393257427. The next prime is 1393257497. The reversal of 1393257487 is 7847523931.

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 1393257487 - 2¹⁵ = 1393224719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1393257487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1393257427) 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, 9542787 + ... + 9542932.

It is an arithmetic number, because the mean of its divisors is an integer number (353085820).

Almost surely, 2^1393257487 is an apocalyptic number.

1393257487 is a deficient number, since it is larger than the sum of its proper divisors (19085793).

1393257487 is an equidigital number, since it uses as much as digits as its factorization.

1393257487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19085792.

The product of its digits is 1270080, while the sum is 49.

The square root of 1393257487 is about 37326.3645028551. The cubic root of 1393257487 is about 1116.8901525318.

The spelling of 1393257487 in words is "one billion, three hundred ninety-three million, two hundred fifty-seven thousand, four hundred eighty-seven".