918401220 has 96 divisors (see below), whose sum is σ = 3117018240. Its totient is φ = 222641280.

The previous prime is 918401171. The next prime is 918401243. The reversal of 918401220 is 22104819.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71367 + ... + 83246.

It is an arithmetic number, because the mean of its divisors is an integer number (32468940).

Almost surely, 2^918401220 is an apocalyptic number.

918401220 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

918401220 is an abundant number, since it is smaller than the sum of its proper divisors (2198617020).

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

918401220 is a wasteful number, since it uses less digits than its factorization.

918401220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154642 (or 154634 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 918401220 is about 30305.1352084098. The cubic root of 918401220 is about 972.0251098528.

The spelling of 918401220 in words is "nine hundred eighteen million, four hundred one thousand, two hundred twenty".