1604731 has 2 divisors, whose sum is σ = 1604732. Its totient is φ = 1604730.

The previous prime is 1604719. The next prime is 1604737. The reversal of 1604731 is 1374061.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604731 is a prime.

It is a super-2 number, since 2×1604731² = 5150323164722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1604737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802365 + 802366.

It is an arithmetic number, because the mean of its divisors is an integer number (802366).

2^1604731 is an apocalyptic number.

1604731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604731 is an equidigital number, since it uses as much as digits as its factorization.

1604731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 1604731 is about 1266.7797756516. The cubic root of 1604731 is about 117.0758754919.

Adding to 1604731 its reverse (1374061), we get a palindrome (2978792).

The spelling of 1604731 in words is "one million, six hundred four thousand, seven hundred thirty-one".