2139391 has 8 divisors (see below), whose sum is σ = 2248704. Its totient is φ = 2031480.

The previous prime is 2139383. The next prime is 2139407. The reversal of 2139391 is 1939312.

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 2139391 - 2³ = 2139383 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 (2139311) 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, 4150 + ... + 4636.

It is an arithmetic number, because the mean of its divisors is an integer number (281088).

2^2139391 is an apocalyptic number.

2139391 is a deficient number, since it is larger than the sum of its proper divisors (109313).

2139391 is a wasteful number, since it uses less digits than its factorization.

2139391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701.

The product of its digits is 1458, while the sum is 28.

The square root of 2139391 is about 1462.6657171070. The cubic root of 2139391 is about 128.8536489017.

It can be divided in two parts, 213 and 9391, that added together give a square (9604 = 98²).

The spelling of 2139391 in words is "two million, one hundred thirty-nine thousand, three hundred ninety-one".