1938239928 has 48 divisors (see below), whose sum is σ = 5443827480. Its totient is φ = 646079328.

The previous prime is 1938239903. The next prime is 1938239959. The reversal of 1938239928 is 8299328391.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 496575 + ... + 500462.

Almost surely, 2^1938239928 is an apocalyptic number.

1938239928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1938239928 is an abundant number, since it is smaller than the sum of its proper divisors (3505587552).

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

1938239928 is an equidigital number, since it uses as much as digits as its factorization.

1938239928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997058 (or 997042 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 1938239928 is about 44025.4463691170. The cubic root of 1938239928 is about 1246.8164166947.

The spelling of 1938239928 in words is "one billion, nine hundred thirty-eight million, two hundred thirty-nine thousand, nine hundred twenty-eight".