1440121155 has 32 divisors (see below), whose sum is σ = 2535943680. Its totient is φ = 692052480.

The previous prime is 1440121139. The next prime is 1440121157. The reversal of 1440121155 is 5511210441.

It is not a de Polignac number, because 1440121155 - 2⁴ = 1440121139 is a prime.

It is a super-3 number, since 3×1440121155³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1440121157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19975 + ... + 57264.

It is an arithmetic number, because the mean of its divisors is an integer number (79248240).

Almost surely, 2^1440121155 is an apocalyptic number.

1440121155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1440121155 is a deficient number, since it is larger than the sum of its proper divisors (1095822525).

1440121155 is a wasteful number, since it uses less digits than its factorization.

1440121155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77371.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 1440121155 is about 37948.9282457357. The cubic root of 1440121155 is about 1129.2749035524.

Adding to 1440121155 its reverse (5511210441), we get a palindrome (6951331596).

The spelling of 1440121155 in words is "one billion, four hundred forty million, one hundred twenty-one thousand, one hundred fifty-five".