1440397838 has 16 divisors (see below), whose sum is σ = 2363247360. Its totient is φ = 652995000.

The previous prime is 1440397823. The next prime is 1440397843. The reversal of 1440397838 is 8387930441.

It is a junction number, because it is equal to n+sod(n) for n = 1440397792 and 1440397801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78038 + ... + 94713.

It is an arithmetic number, because the mean of its divisors is an integer number (147702960).

Almost surely, 2^1440397838 is an apocalyptic number.

1440397838 is a deficient number, since it is larger than the sum of its proper divisors (922849522).

1440397838 is a wasteful number, since it uses less digits than its factorization.

1440397838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173143.

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 1440397838 is about 37952.5735359277. The cubic root of 1440397838 is about 1129.3472194960.

The spelling of 1440397838 in words is "one billion, four hundred forty million, three hundred ninety-seven thousand, eight hundred thirty-eight".