993988018 has 16 divisors (see below), whose sum is σ = 1503571680. Its totient is φ = 492811776.

The previous prime is 993988013. The next prime is 993988031. The reversal of 993988018 is 810889399.

It is a self number, because there is not a number n which added to its sum of digits gives 993988018.

It is not an unprimeable number, because it can be changed into a prime (993988013) 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, 148978 + ... + 155506.

It is an arithmetic number, because the mean of its divisors is an integer number (93973230).

Almost surely, 2^993988018 is an apocalyptic number.

993988018 is a deficient number, since it is larger than the sum of its proper divisors (509583662).

993988018 is a wasteful number, since it uses less digits than its factorization.

993988018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 993988018 is about 31527.5755173150. The cubic root of 993988018 is about 997.9919765407.

It can be divided in two parts, 99398 and 8018, that added together give a triangular number (107416 = T₄₆₃).

The spelling of 993988018 in words is "nine hundred ninety-three million, nine hundred eighty-eight thousand, eighteen".