1440939513 has 8 divisors (see below), whose sum is σ = 2069041408. Its totient is φ = 886731984.

The previous prime is 1440939509. The next prime is 1440939517. The reversal of 1440939513 is 3159390441.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1440939509) and next prime (1440939517).

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

It is not a de Polignac number, because 1440939513 - 2² = 1440939509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 36947167 = 1440939513 / (1 + 4 + 4 + 0 + 9 + 3 + 9 + 5 + 1 + 3).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1440939517) 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, 18473545 + ... + 18473622.

It is an arithmetic number, because the mean of its divisors is an integer number (258630176).

Almost surely, 2^1440939513 is an apocalyptic number.

1440939513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1440939513 is a deficient number, since it is larger than the sum of its proper divisors (628101895).

1440939513 is a wasteful number, since it uses less digits than its factorization.

1440939513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36947183.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 1440939513 is about 37959.7090742276. The cubic root of 1440939513 is about 1129.4887689280.

The spelling of 1440939513 in words is "one billion, four hundred forty million, nine hundred thirty-nine thousand, five hundred thirteen".