2139291 has 50 divisors (see below), whose sum is σ = 4067052. Its totient is φ = 1111320.

The previous prime is 2139283. The next prime is 2139307. The reversal of 2139291 is 1929312.

It is not a de Polignac number, because 2139291 - 2³ = 2139283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2139211) by changing a digit.

It is a polite number, since it can be written in 49 ways as a sum of consecutive naturals, for example, 194476 + ... + 194486.

2^2139291 is an apocalyptic number.

2139291 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2139291 is a deficient number, since it is larger than the sum of its proper divisors (1927761).

2139291 is an frugal number, since it uses more digits than its factorization.

2139291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51 (or 21 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 2139291 is about 1462.6315325467. The cubic root of 2139291 is about 128.8516412329.

The spelling of 2139291 in words is "two million, one hundred thirty-nine thousand, two hundred ninety-one".