1604402025 has 48 divisors (see below), whose sum is σ = 2722849536. Its totient is φ = 833152320.

The previous prime is 1604402017. The next prime is 1604402027. The reversal of 1604402025 is 5202044061.

It is not a de Polignac number, because 1604402025 - 2³ = 1604402017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1604401986 and 1604402004.

It is not an unprimeable number, because it can be changed into a prime (1604402027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1428114 + ... + 1429236.

It is an arithmetic number, because the mean of its divisors is an integer number (56726032).

Almost surely, 2^1604402025 is an apocalyptic number.

1604402025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1604402025 is a deficient number, since it is larger than the sum of its proper divisors (1118447511).

1604402025 is a wasteful number, since it uses less digits than its factorization.

1604402025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1604402025 is about 40054.9875171620. The cubic root of 1604402025 is about 1170.6787463516.

Adding to 1604402025 its reverse (5202044061), we get a palindrome (6806446086).

The spelling of 1604402025 in words is "one billion, six hundred four million, four hundred two thousand, twenty-five".