3138861 has 12 divisors (see below), whose sum is σ = 4600736. Its totient is φ = 1902120.

The previous prime is 3138853. The next prime is 3138869. The reversal of 3138861 is 1688313.

It is an interprime number because it is at equal distance from previous prime (3138853) and next prime (3138869).

It is not a de Polignac number, because 3138861 - 2³ = 3138853 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3138869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3961 + ... + 4686.

Almost surely, 2^3138861 is an apocalyptic number.

It is an amenable number.

3138861 is a deficient number, since it is larger than the sum of its proper divisors (1461875).

3138861 is a wasteful number, since it uses less digits than its factorization.

3138861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8672 (or 8661 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 3138861 is about 1771.6830980737. The cubic root of 3138861 is about 146.4167270893.

The spelling of 3138861 in words is "three million, one hundred thirty-eight thousand, eight hundred sixty-one".