22440428 has 6 divisors (see below), whose sum is σ = 39270756. Its totient is φ = 11220212.

The previous prime is 22440421. The next prime is 22440437. The reversal of 22440428 is 82404422.

It is a junction number, because it is equal to n+sod(n) for n = 22440397 and 22440406.

It is not an unprimeable number, because it can be changed into a prime (22440421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2805050 + ... + 2805057.

It is an arithmetic number, because the mean of its divisors is an integer number (6545126).

Almost surely, 2^22440428 is an apocalyptic number.

It is an amenable number.

22440428 is a deficient number, since it is larger than the sum of its proper divisors (16830328).

22440428 is a wasteful number, since it uses less digits than its factorization.

22440428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5610111 (or 5610109 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

The square root of 22440428 is about 4737.1328881508. The cubic root of 22440428 is about 282.0614355695.

The spelling of 22440428 in words is "twenty-two million, four hundred forty thousand, four hundred twenty-eight".