22140487 has 4 divisors (see below), whose sum is σ = 22163440. Its totient is φ = 22117536.

The previous prime is 22140449. The next prime is 22140493. The reversal of 22140487 is 78404122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78404122 = 2 ⋅39202061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22140487 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 (22140787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9963 + ... + 11980.

It is an arithmetic number, because the mean of its divisors is an integer number (5540860).

Almost surely, 2^22140487 is an apocalyptic number.

22140487 is a deficient number, since it is larger than the sum of its proper divisors (22953).

22140487 is a wasteful number, since it uses less digits than its factorization.

22140487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22952.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 22140487 is about 4705.3678920994. The cubic root of 22140487 is about 280.7991075193.

The spelling of 22140487 in words is "twenty-two million, one hundred forty thousand, four hundred eighty-seven".