22540387 has 2 divisors, whose sum is σ = 22540388. Its totient is φ = 22540386.

The previous prime is 22540373. The next prime is 22540409. The reversal of 22540387 is 78304522.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22540387 is a prime.

It is a super-2 number, since 2×22540387² = 1016138092219538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22540787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11270193 + 11270194.

It is an arithmetic number, because the mean of its divisors is an integer number (11270194).

Almost surely, 2^22540387 is an apocalyptic number.

22540387 is a deficient number, since it is larger than the sum of its proper divisors (1).

22540387 is an equidigital number, since it uses as much as digits as its factorization.

22540387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 22540387 is about 4747.6717451821. The cubic root of 22540387 is about 282.4796215754.

The spelling of 22540387 in words is "twenty-two million, five hundred forty thousand, three hundred eighty-seven".