2139791 has 4 divisors (see below), whose sum is σ = 2151072. Its totient is φ = 2128512.

The previous prime is 2139757. The next prime is 2139811. The reversal of 2139791 is 1979312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2139791 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 (2139091) 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, 5351 + ... + 5736.

It is an arithmetic number, because the mean of its divisors is an integer number (537768).

2^2139791 is an apocalyptic number.

2139791 is a deficient number, since it is larger than the sum of its proper divisors (11281).

2139791 is a wasteful number, since it uses less digits than its factorization.

2139791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11280.

The product of its digits is 3402, while the sum is 32.

The square root of 2139791 is about 1462.8024473592. The cubic root of 2139791 is about 128.8616789513.

The spelling of 2139791 in words is "two million, one hundred thirty-nine thousand, seven hundred ninety-one".