3138731 has 4 divisors (see below), whose sum is σ = 3143232. Its totient is φ = 3134232.

The previous prime is 3138691. The next prime is 3138767. The reversal of 3138731 is 1378313.

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

It is a cyclic number.

It is not a de Polignac number, because 3138731 - 2¹⁴ = 3122347 is a prime.

It is a super-2 number, since 2×3138731² = 19703264580722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3138731.

It is not an unprimeable number, because it can be changed into a prime (3138791) 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, 956 + ... + 2681.

It is an arithmetic number, because the mean of its divisors is an integer number (785808).

Almost surely, 2^3138731 is an apocalyptic number.

3138731 is a deficient number, since it is larger than the sum of its proper divisors (4501).

3138731 is an equidigital number, since it uses as much as digits as its factorization.

3138731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500.

The product of its digits is 1512, while the sum is 26.

The square root of 3138731 is about 1771.6464094170. The cubic root of 3138731 is about 146.4147057152.

The spelling of 3138731 in words is "three million, one hundred thirty-eight thousand, seven hundred thirty-one".