17982879440 has 40 divisors (see below), whose sum is σ = 42051904488. Its totient is φ = 7151567360.

The previous prime is 17982879427. The next prime is 17982879443. The reversal of 17982879440 is 4497828971.

It can be written as a sum of positive squares in 4 ways, for example, as 939054736 + 17043824704 = 30644^2 + 130552^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 17982879440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17982879443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635831 + ... + 663510.

Almost surely, 2^17982879440 is an apocalyptic number.

17982879440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

17982879440 is an abundant number, since it is smaller than the sum of its proper divisors (24069025048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17982879440 is a wasteful number, since it uses less digits than its factorization.

17982879440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299527 (or 1299521 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 59.

The spelling of 17982879440 in words is "seventeen billion, nine hundred eighty-two million, eight hundred seventy-nine thousand, four hundred forty".