3731645 has 4 divisors (see below), whose sum is σ = 4477980. Its totient is φ = 2985312.

The previous prime is 3731627. The next prime is 3731683. The reversal of 3731645 is 5461373.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2343961 + 1387684 = 1531^2 + 1178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3731645 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 373160 + ... + 373169.

It is an arithmetic number, because the mean of its divisors is an integer number (1119495).

Almost surely, 2^3731645 is an apocalyptic number.

It is an amenable number.

3731645 is a deficient number, since it is larger than the sum of its proper divisors (746335).

3731645 is an equidigital number, since it uses as much as digits as its factorization.

3731645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746334.

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

The square root of 3731645 is about 1931.7466189954. The cubic root of 3731645 is about 155.1077294780.

The spelling of 3731645 in words is "three million, seven hundred thirty-one thousand, six hundred forty-five".