3781731 has 4 divisors (see below), whose sum is σ = 5042312. Its totient is φ = 2521152.

The previous prime is 3781727. The next prime is 3781747. The reversal of 3781731 is 1371873.

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

It is not a de Polignac number, because 3781731 - 2² = 3781727 is a prime.

It is a super-2 number, since 2×3781731² = 28602978712722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3781711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630286 + ... + 630291.

It is an arithmetic number, because the mean of its divisors is an integer number (1260578).

Almost surely, 2^3781731 is an apocalyptic number.

3781731 is a deficient number, since it is larger than the sum of its proper divisors (1260581).

3781731 is a wasteful number, since it uses less digits than its factorization.

3781731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260580.

The product of its digits is 3528, while the sum is 30.

The square root of 3781731 is about 1944.6673237343. The cubic root of 3781731 is about 155.7985977530.

The spelling of 3781731 in words is "three million, seven hundred eighty-one thousand, seven hundred thirty-one".