17979397 has 2 divisors, whose sum is σ = 17979398. Its totient is φ = 17979396.

The previous prime is 17979337. The next prime is 17979439. The reversal of 17979397 is 79397971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9400356 + 8579041 = 3066^2 + 2929^2 .

It is an emirp because it is prime and its reverse (79397971) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17979397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17979337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8989698 + 8989699.

It is an arithmetic number, because the mean of its divisors is an integer number (8989699).

Almost surely, 2^17979397 is an apocalyptic number.

It is an amenable number.

17979397 is a deficient number, since it is larger than the sum of its proper divisors (1).

17979397 is an equidigital number, since it uses as much as digits as its factorization.

17979397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 750141, while the sum is 52.

The square root of 17979397 is about 4240.2119050821. The cubic root of 17979397 is about 261.9741102557.

The spelling of 17979397 in words is "seventeen million, nine hundred seventy-nine thousand, three hundred ninety-seven".