22404451 has 4 divisors (see below), whose sum is σ = 22580992. Its totient is φ = 22227912.

The previous prime is 22404427. The next prime is 22404463. The reversal of 22404451 is 15440422.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15440422 = 2 ⋅7720211.

It is a cyclic number.

It is not a de Polignac number, because 22404451 - 2¹⁷ = 22273379 is a prime.

It is a super-2 number, since 2×22404451² = 1003918849222802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22804451) 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, 88080 + ... + 88333.

It is an arithmetic number, because the mean of its divisors is an integer number (5645248).

Almost surely, 2^22404451 is an apocalyptic number.

22404451 is a deficient number, since it is larger than the sum of its proper divisors (176541).

22404451 is a wasteful number, since it uses less digits than its factorization.

22404451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176540.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 22404451 is about 4733.3340258215. The cubic root of 22404451 is about 281.9106191929.

Adding to 22404451 its reverse (15440422), we get a palindrome (37844873).

The spelling of 22404451 in words is "twenty-two million, four hundred four thousand, four hundred fifty-one".