22129939 has 16 divisors (see below), whose sum is σ = 24917760. Its totient is φ = 19514880.

The previous prime is 22129931. The next prime is 22129951. The reversal of 22129939 is 93992122.

22129939 = 1918² + 1919² + ... + 1923².

It is a cyclic number.

It is not a de Polignac number, because 22129939 - 2³ = 22129931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22129898 and 22129907.

It is not an unprimeable number, because it can be changed into a prime (22129931) 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, 35559 + ... + 36175.

It is an arithmetic number, because the mean of its divisors is an integer number (1557360).

Almost surely, 2^22129939 is an apocalyptic number.

22129939 is a deficient number, since it is larger than the sum of its proper divisors (2787821).

22129939 is a wasteful number, since it uses less digits than its factorization.

22129939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750.

The product of its digits is 17496, while the sum is 37.

The square root of 22129939 is about 4704.2469110369. The cubic root of 22129939 is about 280.7545083879.

The spelling of 22129939 in words is "twenty-two million, one hundred twenty-nine thousand, nine hundred thirty-nine".