1440139894 has 16 divisors (see below), whose sum is σ = 2266598880. Its totient is φ = 684953280.

The previous prime is 1440139879. The next prime is 1440139907. The reversal of 1440139894 is 4989310441.

It is a self number, because there is not a number n which added to its sum of digits gives 1440139894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78159 + ... + 94810.

It is an arithmetic number, because the mean of its divisors is an integer number (141662430).

Almost surely, 2^1440139894 is an apocalyptic number.

1440139894 is a deficient number, since it is larger than the sum of its proper divisors (826458986).

1440139894 is a wasteful number, since it uses less digits than its factorization.

1440139894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173175.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 1440139894 is about 37949.1751425509. The cubic root of 1440139894 is about 1129.2798016104.

The spelling of 1440139894 in words is "one billion, four hundred forty million, one hundred thirty-nine thousand, eight hundred ninety-four".