918374621 has 4 divisors (see below), whose sum is σ = 940774044. Its totient is φ = 895975200.

The previous prime is 918374593. The next prime is 918374623. The reversal of 918374621 is 126473819.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 241802500 + 676572121 = 15550^2 + 26011^2 .

It is a cyclic number.

It is not a de Polignac number, because 918374621 - 2¹⁰ = 918373597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 22399381 = 918374621 / (9 + 1 + 8 + 3 + 7 + 4 + 6 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918374623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11199650 + ... + 11199731.

It is an arithmetic number, because the mean of its divisors is an integer number (235193511).

Almost surely, 2^918374621 is an apocalyptic number.

It is an amenable number.

918374621 is a deficient number, since it is larger than the sum of its proper divisors (22399423).

918374621 is a wasteful number, since it uses less digits than its factorization.

918374621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22399422.

The product of its digits is 72576, while the sum is 41.

The square root of 918374621 is about 30304.6963522158. The cubic root of 918374621 is about 972.0157257387.

The spelling of 918374621 in words is "nine hundred eighteen million, three hundred seventy-four thousand, six hundred twenty-one".