919099440 has 320 divisors, whose sum is σ = 3664051200. Its totient is φ = 207415296.

The previous prime is 919099427. The next prime is 919099451. The reversal of 919099440 is 44990919.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1345339 + ... + 1346021.

It is an arithmetic number, because the mean of its divisors is an integer number (11450160).

Almost surely, 2^919099440 is an apocalyptic number.

919099440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 919099440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1832025600).

919099440 is an abundant number, since it is smaller than the sum of its proper divisors (2744951760).

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

919099440 is a wasteful number, since it uses less digits than its factorization.

919099440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 919099440 is about 30316.6528495479. The cubic root of 919099440 is about 972.2713767486.

The spelling of 919099440 in words is "nine hundred nineteen million, ninety-nine thousand, four hundred forty".