3942139 has 4 divisors (see below), whose sum is σ = 4149640. Its totient is φ = 3734640.

The previous prime is 3942137. The next prime is 3942209. The reversal of 3942139 is 9312493.

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

It is not a de Polignac number, because 3942139 - 2¹ = 3942137 is a prime.

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 3942139.

It is not an unprimeable number, because it can be changed into a prime (3942137) 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, 103722 + ... + 103759.

It is an arithmetic number, because the mean of its divisors is an integer number (1037410).

Almost surely, 2^3942139 is an apocalyptic number.

3942139 is a deficient number, since it is larger than the sum of its proper divisors (207501).

3942139 is a wasteful number, since it uses less digits than its factorization.

3942139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207500.

The product of its digits is 5832, while the sum is 31.

The square root of 3942139 is about 1985.4820573352. The cubic root of 3942139 is about 157.9709795549.

The spelling of 3942139 in words is "three million, nine hundred forty-two thousand, one hundred thirty-nine".