22138493 has 12 divisors (see below), whose sum is σ = 24228468. Its totient is φ = 20217600.

The previous prime is 22138481. The next prime is 22138517. The reversal of 22138493 is 39483122.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1545049 + 20593444 = 1243^2 + 4538^2 .

It is not a de Polignac number, because 22138493 - 2⁶ = 22138429 is a prime.

It is a super-2 number, since 2×22138493² = 980225744622098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22138423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16421 + ... + 17717.

It is an arithmetic number, because the mean of its divisors is an integer number (2019039).

Almost surely, 2^22138493 is an apocalyptic number.

It is an amenable number.

22138493 is a deficient number, since it is larger than the sum of its proper divisors (2089975).

22138493 is a wasteful number, since it uses less digits than its factorization.

22138493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424 (or 1411 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 22138493 is about 4705.1560016646. The cubic root of 22138493 is about 280.7906775597.

The spelling of 22138493 in words is "twenty-two million, one hundred thirty-eight thousand, four hundred ninety-three".