22987391 has 4 divisors (see below), whose sum is σ = 26271312. Its totient is φ = 19703472.

The previous prime is 22987387. The next prime is 22987409. The reversal of 22987391 is 19378922.

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: 19378922 = 2 ⋅9689461.

It is a cyclic number.

It is not a de Polignac number, because 22987391 - 2² = 22987387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22987331) 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, 1641950 + ... + 1641963.

It is an arithmetic number, because the mean of its divisors is an integer number (6567828).

Almost surely, 2^22987391 is an apocalyptic number.

22987391 is a deficient number, since it is larger than the sum of its proper divisors (3283921).

22987391 is an equidigital number, since it uses as much as digits as its factorization.

22987391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3283920.

The product of its digits is 54432, while the sum is 41.

The square root of 22987391 is about 4794.5167639711. The cubic root of 22987391 is about 284.3347199077.

The spelling of 22987391 in words is "twenty-two million, nine hundred eighty-seven thousand, three hundred ninety-one".