1440231640 has 32 divisors (see below), whose sum is σ = 3352266000. Its totient is φ = 556226944.

The previous prime is 1440231631. The next prime is 1440231677. The reversal of 1440231640 is 461320441.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 619630 + ... + 621949.

Almost surely, 2^1440231640 is an apocalyptic number.

1440231640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1440231640 is an abundant number, since it is smaller than the sum of its proper divisors (1912034360).

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

1440231640 is a wasteful number, since it uses less digits than its factorization.

1440231640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241619 (or 1241615 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1440231640 is about 37950.3839242767. The cubic root of 1440231640 is about 1129.3037818513.

The spelling of 1440231640 in words is "one billion, four hundred forty million, two hundred thirty-one thousand, six hundred forty".