918871998 has 32 divisors (see below), whose sum is σ = 2122744320. Its totient is φ = 262066560.

The previous prime is 918871997. The next prime is 918871999. The reversal of 918871998 is 899178819.

It is an interprime number because it is at equal distance from previous prime (918871997) and next prime (918871999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918871991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408358 + ... + 410601.

It is an arithmetic number, because the mean of its divisors is an integer number (66335760).

Almost surely, 2^918871998 is an apocalyptic number.

918871998 is an abundant number, since it is smaller than the sum of its proper divisors (1203872322).

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

918871998 is a wasteful number, since it uses less digits than its factorization.

918871998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818992.

The product of its digits is 2612736, while the sum is 60.

The square root of 918871998 is about 30312.9015107429. The cubic root of 918871998 is about 972.1911701245.

The spelling of 918871998 in words is "nine hundred eighteen million, eight hundred seventy-one thousand, nine hundred ninety-eight".