1440120399 has 16 divisors (see below), whose sum is σ = 1957699584. Its totient is φ = 941335200.

The previous prime is 1440120379. The next prime is 1440120403. The reversal of 1440120399 is 9930210441.

It is not a de Polignac number, because 1440120399 - 2⁷ = 1440120271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440120349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422994 + ... + 426384.

It is an arithmetic number, because the mean of its divisors is an integer number (122356224).

Almost surely, 2^1440120399 is an apocalyptic number.

1440120399 is a deficient number, since it is larger than the sum of its proper divisors (517579185).

1440120399 is a wasteful number, since it uses less digits than its factorization.

1440120399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6118.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1440120399 is about 37948.9182849788. The cubic root of 1440120399 is about 1129.2747059459.

The spelling of 1440120399 in words is "one billion, four hundred forty million, one hundred twenty thousand, three hundred ninety-nine".