13991757 has 32 divisors (see below), whose sum is σ = 21159936. Its totient is φ = 8164800.

The previous prime is 13991749. The next prime is 13991767. The reversal of 13991757 is 75719931.

It is not a de Polignac number, because 13991757 - 2³ = 13991749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13991767) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85758 + ... + 85920.

It is an arithmetic number, because the mean of its divisors is an integer number (661248).

Almost surely, 2^13991757 is an apocalyptic number.

It is an amenable number.

13991757 is a deficient number, since it is larger than the sum of its proper divisors (7168179).

13991757 is a wasteful number, since it uses less digits than its factorization.

13991757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281.

The product of its digits is 59535, while the sum is 42.

The square root of 13991757 is about 3740.5557073782. Note that the first 3 decimals coincide. The cubic root of 13991757 is about 240.9669152198.

The spelling of 13991757 in words is "thirteen million, nine hundred ninety-one thousand, seven hundred fifty-seven".