1440612769 has 4 divisors (see below), whose sum is σ = 1467794196. Its totient is φ = 1413431344.

The previous prime is 1440612763. The next prime is 1440612821. The reversal of 1440612769 is 9672160441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 509630625 + 930982144 = 22575^2 + 30512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440612769 is a prime.

It is a super-2 number, since 2×1440612769² = 4150730300411694722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440612763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13590634 + ... + 13590739.

It is an arithmetic number, because the mean of its divisors is an integer number (366948549).

Almost surely, 2^1440612769 is an apocalyptic number.

It is an amenable number.

1440612769 is a deficient number, since it is larger than the sum of its proper divisors (27181427).

1440612769 is an equidigital number, since it uses as much as digits as its factorization.

1440612769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27181426.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1440612769 is about 37955.4050037673. The cubic root of 1440612769 is about 1129.4033890830.

The spelling of 1440612769 in words is "one billion, four hundred forty million, six hundred twelve thousand, seven hundred sixty-nine".