1338021840 has 40 divisors (see below), whose sum is σ = 4147868448. Its totient is φ = 356805760.

The previous prime is 1338021821. The next prime is 1338021851. The reversal of 1338021840 is 481208331.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1338021798 and 1338021807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2787306 + ... + 2787785.

Almost surely, 2^1338021840 is an apocalyptic number.

1338021840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1338021840 is an abundant number, since it is smaller than the sum of its proper divisors (2809846608).

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

1338021840 is a wasteful number, since it uses less digits than its factorization.

1338021840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5575107 (or 5575101 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1338021840 is about 36578.9808496628. The cubic root of 1338021840 is about 1101.9309994203.

The spelling of 1338021840 in words is "one billion, three hundred thirty-eight million, twenty-one thousand, eight hundred forty".