1004405025 has 72 divisors (see below), whose sum is σ = 1817175360. Its totient is φ = 489265920.

The previous prime is 1004405021. The next prime is 1004405069. The reversal of 1004405025 is 5205044001.

It is not a de Polignac number, because 1004405025 - 2² = 1004405021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1004404992 and 1004405010.

It is not an unprimeable number, because it can be changed into a prime (1004405021) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1381212 + ... + 1381938.

Almost surely, 2^1004405025 is an apocalyptic number.

1004405025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1004405025 is a deficient number, since it is larger than the sum of its proper divisors (812770335).

1004405025 is a wasteful number, since it uses less digits than its factorization.

1004405025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 857 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1004405025 is about 31692.3496288931. The cubic root of 1004405025 is about 1001.4661909003.

Adding to 1004405025 its reverse (5205044001), we get a palindrome (6209449026).

The spelling of 1004405025 in words is "one billion, four million, four hundred five thousand, twenty-five".