17972987 has 2 divisors, whose sum is σ = 17972988. Its totient is φ = 17972986.

The previous prime is 17972971. The next prime is 17973017. The reversal of 17972987 is 78927971.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17972987 - 2⁴ = 17972971 is a prime.

It is not a weakly prime, because it can be changed into another prime (17972947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8986493 + 8986494.

It is an arithmetic number, because the mean of its divisors is an integer number (8986494).

Almost surely, 2^17972987 is an apocalyptic number.

17972987 is a deficient number, since it is larger than the sum of its proper divisors (1).

17972987 is an equidigital number, since it uses as much as digits as its factorization.

17972987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 50.

The square root of 17972987 is about 4239.4559792502. The cubic root of 17972987 is about 261.9429736229.

The spelling of 17972987 in words is "seventeen million, nine hundred seventy-two thousand, nine hundred eighty-seven".