1394279645857 has 4 divisors (see below), whose sum is σ = 1593462452416. Its totient is φ = 1195096839300.

The previous prime is 1394279645809. The next prime is 1394279645879. The reversal of 1394279645857 is 7585469724931.

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 1394279645857 - 2⁷ = 1394279645729 is a prime.

It is a super-2 number, since 2×1394279645857² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1394279645897) 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, 99591403269 + ... + 99591403282.

It is an arithmetic number, because the mean of its divisors is an integer number (398365613104).

Almost surely, 2^{1394279645857} is an apocalyptic number.

It is an amenable number.

1394279645857 is a deficient number, since it is larger than the sum of its proper divisors (199182806559).

1394279645857 is an equidigital number, since it uses as much as digits as its factorization.

1394279645857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199182806558.

The product of its digits is 457228800, while the sum is 70.

The spelling of 1394279645857 in words is "one trillion, three hundred ninety-four billion, two hundred seventy-nine million, six hundred forty-five thousand, eight hundred fifty-seven".