1396736621 has 24 divisors (see below), whose sum is σ = 1666836864. Its totient is φ = 1166356800.

The previous prime is 1396736611. The next prime is 1396736701. The reversal of 1396736621 is 1266376931.

It is a happy number.

It is not a de Polignac number, because 1396736621 - 2⁶ = 1396736557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1396736611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1265756 + ... + 1266858.

It is an arithmetic number, because the mean of its divisors is an integer number (69451536).

Almost surely, 2^1396736621 is an apocalyptic number.

It is an amenable number.

1396736621 is a deficient number, since it is larger than the sum of its proper divisors (270100243).

1396736621 is a wasteful number, since it uses less digits than its factorization.

1396736621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761 (or 1754 counting only the distinct ones).

The product of its digits is 244944, while the sum is 44.

The square root of 1396736621 is about 37372.9396890317. The cubic root of 1396736621 is about 1117.8190501146.

The spelling of 1396736621 in words is "one billion, three hundred ninety-six million, seven hundred thirty-six thousand, six hundred twenty-one".