22649897 has 4 divisors (see below), whose sum is σ = 22659780. Its totient is φ = 22640016.

The previous prime is 22649839. The next prime is 22649927. The reversal of 22649897 is 79894622.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 79894622 = 2 ⋅39947311.

It can be written as a sum of positive squares in 2 ways, for example, as 2119936 + 20529961 = 1456^2 + 4531^2 .

It is a cyclic number.

It is not a de Polignac number, because 22649897 - 2¹⁸ = 22387753 is a prime.

It is a super-2 number, since 2×22649897² = 1026035668221218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22649807) 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, 479 + ... + 6747.

It is an arithmetic number, because the mean of its divisors is an integer number (5664945).

Almost surely, 2^22649897 is an apocalyptic number.

It is an amenable number.

22649897 is a deficient number, since it is larger than the sum of its proper divisors (9883).

22649897 is an equidigital number, since it uses as much as digits as its factorization.

22649897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9882.

The product of its digits is 435456, while the sum is 47.

The square root of 22649897 is about 4759.1907925613. The cubic root of 22649897 is about 282.9363481480.

The spelling of 22649897 in words is "twenty-two million, six hundred forty-nine thousand, eight hundred ninety-seven".