13940397 has 16 divisors (see below), whose sum is σ = 20712960. Its totient is φ = 9266400.

The previous prime is 13940393. The next prime is 13940411. The reversal of 13940397 is 79304931.

It is not a de Polignac number, because 13940397 - 2² = 13940393 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13940393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13572 + ... + 14562.

It is an arithmetic number, because the mean of its divisors is an integer number (1294560).

Almost surely, 2^13940397 is an apocalyptic number.

It is an amenable number.

13940397 is a deficient number, since it is larger than the sum of its proper divisors (6772563).

13940397 is an equidigital number, since it uses as much as digits as its factorization.

13940397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1515 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 13940397 is about 3733.6841055451. The cubic root of 13940397 is about 240.6717120085.

The spelling of 13940397 in words is "thirteen million, nine hundred forty thousand, three hundred ninety-seven".