13977621 has 48 divisors (see below), whose sum is σ = 25279488. Its totient is φ = 7257600.

The previous prime is 13977619. The next prime is 13977643. The reversal of 13977621 is 12677931.

It is a happy number.

It is not a de Polignac number, because 13977621 - 2¹ = 13977619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13977611) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32991 + ... + 33411.

It is an arithmetic number, because the mean of its divisors is an integer number (526656).

Almost surely, 2^13977621 is an apocalyptic number.

It is an amenable number.

13977621 is a deficient number, since it is larger than the sum of its proper divisors (11301867).

13977621 is a wasteful number, since it uses less digits than its factorization.

13977621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482 (or 479 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 13977621 is about 3738.6656710650. The cubic root of 13977621 is about 240.8857375164.

The spelling of 13977621 in words is "thirteen million, nine hundred seventy-seven thousand, six hundred twenty-one".