13997407 has 2 divisors, whose sum is σ = 13997408. Its totient is φ = 13997406.

The previous prime is 13997383. The next prime is 13997411. The reversal of 13997407 is 70479931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13997407 - 2⁷ = 13997279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13997407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13997497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6998703 + 6998704.

It is an arithmetic number, because the mean of its divisors is an integer number (6998704).

Almost surely, 2^13997407 is an apocalyptic number.

13997407 is a deficient number, since it is larger than the sum of its proper divisors (1).

13997407 is an equidigital number, since it uses as much as digits as its factorization.

13997407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 13997407 is about 3741.3108665279. The cubic root of 13997407 is about 240.9993457395. Note that the first 3 decimals are identical.

The spelling of 13997407 in words is "thirteen million, nine hundred ninety-seven thousand, four hundred seven".