1393125257 has 4 divisors (see below), whose sum is σ = 1394843856. Its totient is φ = 1391406660.

The previous prime is 1393125233. The next prime is 1393125269. The reversal of 1393125257 is 7525213931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1393125257 - 2⁸ = 1393125001 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 1393125257.

It is not an unprimeable number, because it can be changed into a prime (1393127257) 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, 858083 + ... + 859704.

It is an arithmetic number, because the mean of its divisors is an integer number (348710964).

Almost surely, 2^1393125257 is an apocalyptic number.

It is an amenable number.

1393125257 is a deficient number, since it is larger than the sum of its proper divisors (1718599).

1393125257 is an equidigital number, since it uses as much as digits as its factorization.

1393125257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718598.

The product of its digits is 56700, while the sum is 38.

The square root of 1393125257 is about 37324.5931926927. The cubic root of 1393125257 is about 1116.8548178195.

The spelling of 1393125257 in words is "one billion, three hundred ninety-three million, one hundred twenty-five thousand, two hundred fifty-seven".