1440661881 has 8 divisors (see below), whose sum is σ = 1925087584. Its totient is φ = 958338720.

The previous prime is 1440661877. The next prime is 1440661891. The reversal of 1440661881 is 1881660441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1440661881 - 2² = 1440661877 is a prime.

It is a super-2 number, since 2×1440661881² = 4151013310732916322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1440661891) 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, 524035 + ... + 526776.

It is an arithmetic number, because the mean of its divisors is an integer number (240635948).

Almost surely, 2^1440661881 is an apocalyptic number.

It is an amenable number.

1440661881 is a deficient number, since it is larger than the sum of its proper divisors (484425703).

1440661881 is a wasteful number, since it uses less digits than its factorization.

1440661881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051271.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 1440661881 is about 37956.0519680327. The cubic root of 1440661881 is about 1129.4162231191.

The spelling of 1440661881 in words is "one billion, four hundred forty million, six hundred sixty-one thousand, eight hundred eighty-one".