1144426440 has 64 divisors (see below), whose sum is σ = 3517032960. Its totient is φ = 297735680.

The previous prime is 1144426421. The next prime is 1144426447. The reversal of 1144426440 is 446244411.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1144426398 and 1144426407.

It is not an unprimeable number, because it can be changed into a prime (1144426447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111384 + ... + 121223.

It is an arithmetic number, because the mean of its divisors is an integer number (54953640).

Almost surely, 2^1144426440 is an apocalyptic number.

1144426440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1144426440 is an abundant number, since it is smaller than the sum of its proper divisors (2372606520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1144426440 is a wasteful number, since it uses less digits than its factorization.

1144426440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232662 (or 232658 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 30.

The square root of 1144426440 is about 33829.3724446671. The cubic root of 1144426440 is about 1045.9942431138.

The spelling of 1144426440 in words is "one billion, one hundred forty-four million, four hundred twenty-six thousand, four hundred forty".