1440649393 has 8 divisors (see below), whose sum is σ = 1453794120. Its totient is φ = 1427543040.

The previous prime is 1440649387. The next prime is 1440649421. The reversal of 1440649393 is 3939460441.

It can be written as a sum of positive squares in 4 ways, for example, as 365268544 + 1075380849 = 19112^2 + 32793^2 .

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 1440649393 - 2¹³ = 1440641201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440649303) 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, 68713 + ... + 87193.

It is an arithmetic number, because the mean of its divisors is an integer number (181724265).

Almost surely, 2^1440649393 is an apocalyptic number.

It is an amenable number.

1440649393 is a deficient number, since it is larger than the sum of its proper divisors (13144727).

1440649393 is a wasteful number, since it uses less digits than its factorization.

1440649393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19187.

The product of its (nonzero) digits is 279936, while the sum is 43.

The square root of 1440649393 is about 37955.8874616310. The cubic root of 1440649393 is about 1129.4129597602.

The spelling of 1440649393 in words is "one billion, four hundred forty million, six hundred forty-nine thousand, three hundred ninety-three".