1440000156 has 24 divisors (see below), whose sum is σ = 3840000640. Its totient is φ = 411428592.

The previous prime is 1440000143. The next prime is 1440000157. The reversal of 1440000156 is 6510000441.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440000157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8571346 + ... + 8571513.

Almost surely, 2^1440000156 is an apocalyptic number.

It is an amenable number.

1440000156 is an abundant number, since it is smaller than the sum of its proper divisors (2400000484).

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

1440000156 is a wasteful number, since it uses less digits than its factorization.

1440000156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17142873 (or 17142871 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1440000156 is about 37947.3339775010. Note that the first 3 decimals coincide. The cubic root of 1440000156 is about 1129.2432754355.

Adding to 1440000156 its reverse (6510000441), we get a palindrome (7950000597).

The spelling of 1440000156 in words is "one billion, four hundred forty million, one hundred fifty-six", and thus it is an aban number.