1338666520 has 16 divisors (see below), whose sum is σ = 3011999760. Its totient is φ = 535466592.

The previous prime is 1338666509. The next prime is 1338666557. The reversal of 1338666520 is 256668331.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 33466663 = 1338666520 / (1 + 3 + 3 + 8 + 6 + 6 + 6 + 5 + 2 + 0).

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, 16733292 + ... + 16733371.

It is an arithmetic number, because the mean of its divisors is an integer number (188249985).

Almost surely, 2^1338666520 is an apocalyptic number.

1338666520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1338666520 is an abundant number, since it is smaller than the sum of its proper divisors (1673333240).

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

1338666520 is a wasteful number, since it uses less digits than its factorization.

1338666520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33466674 (or 33466670 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 1338666520 is about 36587.7919530545. The cubic root of 1338666520 is about 1102.1079469093.

The spelling of 1338666520 in words is "one billion, three hundred thirty-eight million, six hundred sixty-six thousand, five hundred twenty".