1440402156 has 48 divisors (see below), whose sum is σ = 3835315680. Its totient is φ = 467156160.

The previous prime is 1440402143. The next prime is 1440402157. The reversal of 1440402156 is 6512040441.

1440402156 is a `hidden beast` number, since 1 + 440 + 4 + 0 + 215 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1440402157) 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, 176235 + ... + 184226.

It is an arithmetic number, because the mean of its divisors is an integer number (79902410).

Almost surely, 2^1440402156 is an apocalyptic number.

It is an amenable number.

1440402156 is an abundant number, since it is smaller than the sum of its proper divisors (2394913524).

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

1440402156 is a wasteful number, since it uses less digits than its factorization.

1440402156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360511 (or 360503 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1440402156 is about 37952.6304226729. The cubic root of 1440402156 is about 1129.3483480075.

Adding to 1440402156 its reverse (6512040441), we get a palindrome (7952442597).

The spelling of 1440402156 in words is "one billion, four hundred forty million, four hundred two thousand, one hundred fifty-six".