1440153660 has 96 divisors (see below), whose sum is σ = 4440344832. Its totient is φ = 345848320.

The previous prime is 1440153643. The next prime is 1440153679. The reversal of 1440153660 is 663510441.

It is a super-2 number, since 2×1440153660² = 4148085128822791200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60424 + ... + 80816.

It is an arithmetic number, because the mean of its divisors is an integer number (46253592).

Almost surely, 2^1440153660 is an apocalyptic number.

1440153660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1440153660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2220172416).

1440153660 is an abundant number, since it is smaller than the sum of its proper divisors (3000191172).

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

1440153660 is a wasteful number, since it uses less digits than its factorization.

1440153660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20523 (or 20521 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1440153660 is about 37949.3565162836. The cubic root of 1440153660 is about 1129.2833997831.

The spelling of 1440153660 in words is "one billion, four hundred forty million, one hundred fifty-three thousand, six hundred sixty".