2139491 has 8 divisors (see below), whose sum is σ = 2192400. Its totient is φ = 2087392.

The previous prime is 2139481. The next prime is 2139493. The reversal of 2139491 is 1949312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2139491 - 2⁶ = 2139427 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 (2139493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12281 + ... + 12453.

It is an arithmetic number, because the mean of its divisors is an integer number (274050).

2^2139491 is an apocalyptic number.

2139491 is a deficient number, since it is larger than the sum of its proper divisors (52909).

2139491 is a wasteful number, since it uses less digits than its factorization.

2139491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405.

The product of its digits is 1944, while the sum is 29.

The square root of 2139491 is about 1462.6999008683. The cubic root of 2139491 is about 128.8556565079.

The spelling of 2139491 in words is "two million, one hundred thirty-nine thousand, four hundred ninety-one".