1604425731 has 8 divisors (see below), whose sum is σ = 2159227584. Its totient is φ = 1059620520.

The previous prime is 1604425723. The next prime is 1604425733. The reversal of 1604425731 is 1375244061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1604425731 - 2³ = 1604425723 is a prime.

It is a super-2 number, since 2×1604425731² = 5148363852589768722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1604425692 and 1604425701.

It is not an unprimeable number, because it can be changed into a prime (1604425733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2498785 + ... + 2499426.

It is an arithmetic number, because the mean of its divisors is an integer number (269903448).

Almost surely, 2^1604425731 is an apocalyptic number.

1604425731 is a deficient number, since it is larger than the sum of its proper divisors (554801853).

1604425731 is a wasteful number, since it uses less digits than its factorization.

1604425731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4998321.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 1604425731 is about 40055.2834342737. The cubic root of 1604425731 is about 1170.6845121496.

Adding to 1604425731 its reverse (1375244061), we get a palindrome (2979669792).

The spelling of 1604425731 in words is "one billion, six hundred four million, four hundred twenty-five thousand, seven hundred thirty-one".