3645731 has 2 divisors, whose sum is σ = 3645732. Its totient is φ = 3645730.

The previous prime is 3645727. The next prime is 3645737. The reversal of 3645731 is 1375463.

3645731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3645731 - 2² = 3645727 is a prime.

It is a super-2 number, since 2×3645731² = 26582709048722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3645694 and 3645703.

It is not a weakly prime, because it can be changed into another prime (3645737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1822865 + 1822866.

It is an arithmetic number, because the mean of its divisors is an integer number (1822866).

Almost surely, 2^3645731 is an apocalyptic number.

3645731 is a deficient number, since it is larger than the sum of its proper divisors (1).

3645731 is an equidigital number, since it uses as much as digits as its factorization.

3645731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 29.

The square root of 3645731 is about 1909.3797422200. The cubic root of 3645731 is about 153.9081225167.

The spelling of 3645731 in words is "three million, six hundred forty-five thousand, seven hundred thirty-one".