2139945 has 16 divisors (see below), whose sum is σ = 3447360. Its totient is φ = 1133504.

The previous prime is 2139937. The next prime is 2139947. The reversal of 2139945 is 5499312.

It is a cyclic number.

It is not a de Polignac number, because 2139945 - 2³ = 2139937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2139947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2287 + ... + 3083.

It is an arithmetic number, because the mean of its divisors is an integer number (215460).

2^2139945 is an apocalyptic number.

It is an amenable number.

2139945 is a deficient number, since it is larger than the sum of its proper divisors (1307415).

2139945 is a wasteful number, since it uses less digits than its factorization.

2139945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984.

The product of its digits is 9720, while the sum is 33.

The square root of 2139945 is about 1462.8550850990. The cubic root of 2139945 is about 128.8647702536.

The spelling of 2139945 in words is "two million, one hundred thirty-nine thousand, nine hundred forty-five".