22440477 has 4 divisors (see below), whose sum is σ = 29920640. Its totient is φ = 14960316.

The previous prime is 22440449. The next prime is 22440487. The reversal of 22440477 is 77404422.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-22440477 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 (22440437) 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, 3740077 + ... + 3740082.

It is an arithmetic number, because the mean of its divisors is an integer number (7480160).

Almost surely, 2^22440477 is an apocalyptic number.

It is an amenable number.

22440477 is a deficient number, since it is larger than the sum of its proper divisors (7480163).

22440477 is an equidigital number, since it uses as much as digits as its factorization.

22440477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7480162.

The product of its (nonzero) digits is 12544, while the sum is 30.

The square root of 22440477 is about 4737.1380600527. The cubic root of 22440477 is about 282.0616408686.

Adding to 22440477 its reverse (77404422), we get a palindrome (99844899).

The spelling of 22440477 in words is "twenty-two million, four hundred forty thousand, four hundred seventy-seven".