1396349857 has 4 divisors (see below), whose sum is σ = 1595828416. Its totient is φ = 1196871300.

The previous prime is 1396349839. The next prime is 1396349863. The reversal of 1396349857 is 7589436931.

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 a de Polignac number, because none of the positive numbers 2^k-1396349857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1396349798 and 1396349807.

It is not an unprimeable number, because it can be changed into a prime (1396349827) 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, 99739269 + ... + 99739282.

It is an arithmetic number, because the mean of its divisors is an integer number (398957104).

Almost surely, 2^1396349857 is an apocalyptic number.

It is an amenable number.

1396349857 is a deficient number, since it is larger than the sum of its proper divisors (199478559).

1396349857 is an equidigital number, since it uses as much as digits as its factorization.

1396349857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199478558.

The product of its digits is 4898880, while the sum is 55.

The square root of 1396349857 is about 37367.7649452038. The cubic root of 1396349857 is about 1117.7158638561.

The spelling of 1396349857 in words is "one billion, three hundred ninety-six million, three hundred forty-nine thousand, eight hundred fifty-seven".