1438288920 has 64 divisors (see below), whose sum is σ = 4794300000. Its totient is φ = 383543424.

The previous prime is 1438288909. The next prime is 1438288921. The reversal of 1438288920 is 298828341.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438288921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 664795 + ... + 666954.

Almost surely, 2^1438288920 is an apocalyptic number.

1438288920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1438288920 is an abundant number, since it is smaller than the sum of its proper divisors (3356011080).

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

1438288920 is a wasteful number, since it uses less digits than its factorization.

1438288920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331769 (or 1331759 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 1438288920 is about 37924.7797620500. The cubic root of 1438288920 is about 1128.7957829577.

The spelling of 1438288920 in words is "one billion, four hundred thirty-eight million, two hundred eighty-eight thousand, nine hundred twenty".