17970981 has 32 divisors (see below), whose sum is σ = 29583360. Its totient is φ = 9476544.

The previous prime is 17970977. The next prime is 17970991. The reversal of 17970981 is 18907971.

It is a happy number.

It is not a de Polignac number, because 17970981 - 2² = 17970977 is a prime.

It is a super-2 number, since 2×17970981² = 645912316204722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17970991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13366 + ... + 14648.

It is an arithmetic number, because the mean of its divisors is an integer number (924480).

Almost surely, 2^17970981 is an apocalyptic number.

It is an amenable number.

17970981 is a deficient number, since it is larger than the sum of its proper divisors (11612379).

17970981 is a wasteful number, since it uses less digits than its factorization.

17970981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 17970981 is about 4239.2193856888. The cubic root of 17970981 is about 261.9332279389.

The spelling of 17970981 in words is "seventeen million, nine hundred seventy thousand, nine hundred eighty-one".