1440921897 has 12 divisors (see below), whose sum is σ = 2092961520. Its totient is φ = 955246968.

The previous prime is 1440921893. The next prime is 1440921901. The reversal of 1440921897 is 7981290441.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1440921893) and next prime (1440921901).

It is not a de Polignac number, because 1440921897 - 2² = 1440921893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1440921893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 445603 + ... + 448824.

It is an arithmetic number, because the mean of its divisors is an integer number (174413460).

Almost surely, 2^1440921897 is an apocalyptic number.

It is an amenable number.

1440921897 is a deficient number, since it is larger than the sum of its proper divisors (652039623).

1440921897 is a wasteful number, since it uses less digits than its factorization.

1440921897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894612 (or 894609 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1440921897 is about 37959.4770380204. The cubic root of 1440921897 is about 1129.4841661081.

The spelling of 1440921897 in words is "one billion, four hundred forty million, nine hundred twenty-one thousand, eight hundred ninety-seven".