1440809764 has 9 divisors (see below), whose sum is σ = 2521549947. Its totient is φ = 720366924.

The previous prime is 1440809759. The next prime is 1440809791. The reversal of 1440809764 is 4679080441.

The square root of 1440809764 is 37958.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1440809764.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 66427 + ... + 85405.

Almost surely, 2^1440809764 is an apocalyptic number.

1440809764 is the 37958-th square number.

It is an amenable number.

1440809764 is a deficient number, since it is larger than the sum of its proper divisors (1080740183).

1440809764 is an frugal number, since it uses more digits than its factorization.

1440809764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37962 (or 18981 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The cubic root of 1440809764 is about 1129.4548664092.

The spelling of 1440809764 in words is "one billion, four hundred forty million, eight hundred nine thousand, seven hundred sixty-four".