1440013155 has 32 divisors (see below), whose sum is σ = 2635545600. Its totient is φ = 657697152.

The previous prime is 1440013129. The next prime is 1440013163. The reversal of 1440013155 is 5513100441.

It is a happy number.

It is not a de Polignac number, because 1440013155 - 2⁵ = 1440013123 is a prime.

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, 123466 + ... + 134624.

It is an arithmetic number, because the mean of its divisors is an integer number (82360800).

Almost surely, 2^1440013155 is an apocalyptic number.

1440013155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1440013155 is a deficient number, since it is larger than the sum of its proper divisors (1195532445).

1440013155 is a wasteful number, since it uses less digits than its factorization.

1440013155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12403.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1440013155 is about 37947.5052539689. The cubic root of 1440013155 is about 1129.2466733493.

Adding to 1440013155 its reverse (5513100441), we get a palindrome (6953113596).

The spelling of 1440013155 in words is "one billion, four hundred forty million, thirteen thousand, one hundred fifty-five".