1440831987 has 24 divisors (see below), whose sum is σ = 2481932544. Its totient is φ = 787534704.

The previous prime is 1440831967. The next prime is 1440832007. The reversal of 1440831987 is 7891380441.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1440831967) and next prime (1440832007).

It is not a de Polignac number, because 1440831987 - 2¹⁵ = 1440799219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1440831907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 495733 + ... + 498630.

It is an arithmetic number, because the mean of its divisors is an integer number (103413856).

Almost surely, 2^1440831987 is an apocalyptic number.

1440831987 is a deficient number, since it is larger than the sum of its proper divisors (1041100557).

1440831987 is a wasteful number, since it uses less digits than its factorization.

1440831987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994399 (or 994396 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1440831987 is about 37958.2927303113. The cubic root of 1440831987 is about 1129.4606732702.

It can be divided in two parts, 144083 and 1987, that added together give a triangular number (146070 = T₅₄₀).

The spelling of 1440831987 in words is "one billion, four hundred forty million, eight hundred thirty-one thousand, nine hundred eighty-seven".