1004390400 has 288 divisors, whose sum is σ = 3582895680. Its totient is φ = 246743040.

The previous prime is 1004390399. The next prime is 1004390411. The reversal of 1004390400 is 40934001.

It is a super-2 number, since 2×1004390400² = 2017600151224320000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1996549 + ... + 1997051.

It is an arithmetic number, because the mean of its divisors is an integer number (12440610).

Almost surely, 2^1004390400 is an apocalyptic number.

1004390400 is a gapful number since it is divisible by the number (10) 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 1004390400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1791447840).

1004390400 is an abundant number, since it is smaller than the sum of its proper divisors (2578505280).

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

1004390400 is a wasteful number, since it uses less digits than its factorization.

1004390400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1004390400 is about 31692.1188941352. The cubic root of 1004390400 is about 1001.4613301407.

The spelling of 1004390400 in words is "one billion, four million, three hundred ninety thousand, four hundred".