919397904 has 80 divisors (see below), whose sum is σ = 2523558720. Its totient is φ = 287884800.

The previous prime is 919397881. The next prime is 919397909. The reversal of 919397904 is 409793919.

It is not an unprimeable number, because it can be changed into a prime (919397909) 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, 42579 + ... + 60429.

It is an arithmetic number, because the mean of its divisors is an integer number (31544484).

Almost surely, 2^919397904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 919397904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1261779360).

919397904 is an abundant number, since it is smaller than the sum of its proper divisors (1604160816).

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

919397904 is a wasteful number, since it uses less digits than its factorization.

919397904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17928 (or 17922 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 51.

The square root of 919397904 is about 30321.5748931351. The cubic root of 919397904 is about 972.3766089596.

The spelling of 919397904 in words is "nine hundred nineteen million, three hundred ninety-seven thousand, nine hundred four".