1440652139 has 8 divisors (see below), whose sum is σ = 1445202480. Its totient is φ = 1436109696.

The previous prime is 1440652123. The next prime is 1440652141. The reversal of 1440652139 is 9312560441.

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

It is a cyclic number.

It is not a de Polignac number, because 1440652139 - 2⁴ = 1440652123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1440652099 and 1440652108.

It is not an unprimeable number, because it can be changed into a prime (1440652159) 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, 673079 + ... + 675215.

It is an arithmetic number, because the mean of its divisors is an integer number (180650310).

Almost surely, 2^1440652139 is an apocalyptic number.

1440652139 is a deficient number, since it is larger than the sum of its proper divisors (4550341).

1440652139 is a wasteful number, since it uses less digits than its factorization.

1440652139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1440652139 is about 37955.9236351851. The cubic root of 1440652139 is about 1129.4136773454.

The spelling of 1440652139 in words is "one billion, four hundred forty million, six hundred fifty-two thousand, one hundred thirty-nine".