1338864820 has 24 divisors (see below), whose sum is σ = 2816430624. Its totient is φ = 534628896.

The previous prime is 1338864763. The next prime is 1338864823. The reversal of 1338864820 is 284688331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338864823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45282 + ... + 68761.

It is an arithmetic number, because the mean of its divisors is an integer number (117351276).

Almost surely, 2^1338864820 is an apocalyptic number.

1338864820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1338864820 is an abundant number, since it is smaller than the sum of its proper divisors (1477565804).

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

1338864820 is a wasteful number, since it uses less digits than its factorization.

1338864820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114639 (or 114637 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 1338864820 is about 36590.5017730011. The cubic root of 1338864820 is about 1102.1623635526.

The spelling of 1338864820 in words is "one billion, three hundred thirty-eight million, eight hundred sixty-four thousand, eight hundred twenty".