22738729 has 4 divisors (see below), whose sum is σ = 24487876. Its totient is φ = 20989584.

The previous prime is 22738679. The next prime is 22738733. The reversal of 22738729 is 92783722.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11042329 + 11696400 = 3323^2 + 3420^2 .

It is a cyclic number.

It is not a de Polignac number, because 22738729 - 2¹⁷ = 22607657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22738691 and 22738700.

It is not an unprimeable number, because it can be changed into a prime (22738759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 874554 + ... + 874579.

It is an arithmetic number, because the mean of its divisors is an integer number (6121969).

Almost surely, 2^22738729 is an apocalyptic number.

It is an amenable number.

22738729 is a deficient number, since it is larger than the sum of its proper divisors (1749147).

22738729 is a wasteful number, since it uses less digits than its factorization.

22738729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749146.

The product of its digits is 84672, while the sum is 40.

The square root of 22738729 is about 4768.5143388691. The cubic root of 22738729 is about 283.3057540245.

The spelling of 22738729 in words is "twenty-two million, seven hundred thirty-eight thousand, seven hundred twenty-nine".