1396667257 has 4 divisors (see below), whose sum is σ = 1470176080. Its totient is φ = 1323158436.

The previous prime is 1396667243. The next prime is 1396667269. The reversal of 1396667257 is 7527666931.

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 a de Polignac number, because none of the positive numbers 2^k-1396667257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1396667957) 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, 36754383 + ... + 36754420.

It is an arithmetic number, because the mean of its divisors is an integer number (367544020).

Almost surely, 2^1396667257 is an apocalyptic number.

It is an amenable number.

1396667257 is a deficient number, since it is larger than the sum of its proper divisors (73508823).

1396667257 is an equidigital number, since it uses as much as digits as its factorization.

1396667257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73508822.

The product of its digits is 2857680, while the sum is 52.

The square root of 1396667257 is about 37372.0116798655. The cubic root of 1396667257 is about 1117.8005456276.

The spelling of 1396667257 in words is "one billion, three hundred ninety-six million, six hundred sixty-seven thousand, two hundred fifty-seven".