1386970257 has 4 divisors (see below), whose sum is σ = 1849293680. Its totient is φ = 924646836.

The previous prime is 1386970253. The next prime is 1386970259. The reversal of 1386970257 is 7520796831.

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 not a de Polignac number, because 1386970257 - 2² = 1386970253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1386970253) 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, 231161707 + ... + 231161712.

It is an arithmetic number, because the mean of its divisors is an integer number (462323420).

Almost surely, 2^1386970257 is an apocalyptic number.

It is an amenable number.

1386970257 is a deficient number, since it is larger than the sum of its proper divisors (462323423).

1386970257 is an equidigital number, since it uses as much as digits as its factorization.

1386970257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462323422.

The product of its (nonzero) digits is 635040, while the sum is 48.

The square root of 1386970257 is about 37242.0495810851. The cubic root of 1386970257 is about 1115.2075885553.

The spelling of 1386970257 in words is "one billion, three hundred eighty-six million, nine hundred seventy thousand, two hundred fifty-seven".