1440623749 has 24 divisors (see below), whose sum is σ = 1557459488. Its totient is φ = 1331225280.

The previous prime is 1440623693. The next prime is 1440623753. The reversal of 1440623749 is 9473260441.

It is not a de Polignac number, because 1440623749 - 2⁷ = 1440623621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440683749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2084494 + ... + 2085184.

Almost surely, 2^1440623749 is an apocalyptic number.

It is an amenable number.

1440623749 is a deficient number, since it is larger than the sum of its proper divisors (116835739).

1440623749 is an equidigital number, since it uses as much as digits as its factorization.

1440623749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 1440623749 is about 37955.5496469225. The cubic root of 1440623749 is about 1129.4062584216.

The spelling of 1440623749 in words is "one billion, four hundred forty million, six hundred twenty-three thousand, seven hundred forty-nine".