1438370840 has 16 divisors (see below), whose sum is σ = 3236334480. Its totient is φ = 575348320.

The previous prime is 1438370831. The next prime is 1438370863. The reversal of 1438370840 is 480738341.

It is a junction number, because it is equal to n+sod(n) for n = 1438370794 and 1438370803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17979596 + ... + 17979675.

It is an arithmetic number, because the mean of its divisors is an integer number (202270905).

Almost surely, 2^1438370840 is an apocalyptic number.

1438370840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1438370840 is an abundant number, since it is smaller than the sum of its proper divisors (1797963640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1438370840 is a wasteful number, since it uses less digits than its factorization.

1438370840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35959282 (or 35959278 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 1438370840 is about 37925.8597793115. The cubic root of 1438370840 is about 1128.8172133286.

The spelling of 1438370840 in words is "one billion, four hundred thirty-eight million, three hundred seventy thousand, eight hundred forty".