938321820 has 120 divisors (see below), whose sum is σ = 2951381664. Its totient is φ = 249554304.

The previous prime is 938321809. The next prime is 938321833. The reversal of 938321820 is 28123839.

It is a happy number.

It is a super-2 number, since 2×938321820² = 1760895675776224800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1057417 + ... + 1058303.

Almost surely, 2^938321820 is an apocalyptic number.

938321820 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 938321820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1475690832).

938321820 is an abundant number, since it is smaller than the sum of its proper divisors (2013059844).

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

938321820 is a wasteful number, since it uses less digits than its factorization.

938321820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561 (or 1550 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 938321820 is about 30632.0391094031. The cubic root of 938321820 is about 979.0028104588.

The spelling of 938321820 in words is "nine hundred thirty-eight million, three hundred twenty-one thousand, eight hundred twenty".