918921424 has 40 divisors (see below), whose sum is σ = 1804884480. Its totient is φ = 453186048.

The previous prime is 918921371. The next prime is 918921427. The reversal of 918921424 is 424129819.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918921427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409297 + ... + 411535.

It is an arithmetic number, because the mean of its divisors is an integer number (45122112).

Almost surely, 2^918921424 is an apocalyptic number.

It is an amenable number.

918921424 is a deficient number, since it is larger than the sum of its proper divisors (885963056).

918921424 is a wasteful number, since it uses less digits than its factorization.

918921424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587 (or 2581 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 918921424 is about 30313.7167632080. The cubic root of 918921424 is about 972.2086011557.

The spelling of 918921424 in words is "nine hundred eighteen million, nine hundred twenty-one thousand, four hundred twenty-four".