3138739 has 4 divisors (see below), whose sum is σ = 3157056. Its totient is φ = 3120424.

The previous prime is 3138691. The next prime is 3138767. The reversal of 3138739 is 9378313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9378313 = 7 ⋅1339759.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3138739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3138769) 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, 8899 + ... + 9244.

It is an arithmetic number, because the mean of its divisors is an integer number (789264).

Almost surely, 2^3138739 is an apocalyptic number.

3138739 is a deficient number, since it is larger than the sum of its proper divisors (18317).

3138739 is a wasteful number, since it uses less digits than its factorization.

3138739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18316.

The product of its digits is 13608, while the sum is 34.

The square root of 3138739 is about 1771.6486672024. The cubic root of 3138739 is about 146.4148301091.

The spelling of 3138739 in words is "three million, one hundred thirty-eight thousand, seven hundred thirty-nine".