1396993657 has 8 divisors (see below), whose sum is σ = 1424509632. Its totient is φ = 1369695600.

The previous prime is 1396993613. The next prime is 1396993679. The reversal of 1396993657 is 7563996931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1396993657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1396993057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41503 + ... + 67204.

It is an arithmetic number, because the mean of its divisors is an integer number (178063704).

Almost surely, 2^1396993657 is an apocalyptic number.

It is an amenable number.

1396993657 is a deficient number, since it is larger than the sum of its proper divisors (27515975).

1396993657 is a wasteful number, since it uses less digits than its factorization.

1396993657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108959.

The product of its digits is 8266860, while the sum is 58.

The square root of 1396993657 is about 37376.3783290998. The cubic root of 1396993657 is about 1117.8876152041.

The spelling of 1396993657 in words is "one billion, three hundred ninety-six million, nine hundred ninety-three thousand, six hundred fifty-seven".