13997990 has 16 divisors (see below), whose sum is σ = 25278480. Its totient is φ = 5580960.

The previous prime is 13997983. The next prime is 13997993. The reversal of 13997990 is 9979931.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13997993) 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, 1196 + ... + 5424.

It is an arithmetic number, because the mean of its divisors is an integer number (1579905).

Almost surely, 2^13997990 is an apocalyptic number.

13997990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13997990 is a deficient number, since it is larger than the sum of its proper divisors (11280490).

13997990 is a wasteful number, since it uses less digits than its factorization.

13997990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 13997990 is about 3741.3887795844. The cubic root of 13997990 is about 241.0026916132.

The spelling of 13997990 in words is "thirteen million, nine hundred ninety-seven thousand, nine hundred ninety".