22891906 has 4 divisors (see below), whose sum is σ = 34337862. Its totient is φ = 11445952.

The previous prime is 22891861. The next prime is 22891907. The reversal of 22891906 is 60919822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60919822 = 2 ⋅30459911.

It can be written as a sum of positive squares in only one way, i.e., 19316025 + 3575881 = 4395^2 + 1891^2 .

It is not an unprimeable number, because it can be changed into a prime (22891907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5722975 + ... + 5722978.

Almost surely, 2^22891906 is an apocalyptic number.

22891906 is a deficient number, since it is larger than the sum of its proper divisors (11445956).

22891906 is a wasteful number, since it uses less digits than its factorization.

22891906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11445955.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 22891906 is about 4784.5486725500. The cubic root of 22891906 is about 283.9404837924.

The spelling of 22891906 in words is "twenty-two million, eight hundred ninety-one thousand, nine hundred six".