1440626481 has 24 divisors (see below), whose sum is σ = 2382358784. Its totient is φ = 821767680.

The previous prime is 1440626479. The next prime is 1440626497. The reversal of 1440626481 is 1846260441.

It is a happy number.

1440626481 is a `hidden beast` number, since 1 + 4 + 4 + 0 + 6 + 2 + 648 + 1 = 666.

It is not a de Polignac number, because 1440626481 - 2¹ = 1440626479 is a prime.

It is a super-2 number, since 2×1440626481² = 4150809315516886722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440626381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16536 + ... + 56166.

Almost surely, 2^1440626481 is an apocalyptic number.

It is an amenable number.

1440626481 is a deficient number, since it is larger than the sum of its proper divisors (941732303).

1440626481 is a wasteful number, since it uses less digits than its factorization.

1440626481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40221 (or 40218 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 1440626481 is about 37955.5856363724. The cubic root of 1440626481 is about 1129.4069723568.

The spelling of 1440626481 in words is "one billion, four hundred forty million, six hundred twenty-six thousand, four hundred eighty-one".