1938742992 has 80 divisors (see below), whose sum is σ = 5656215360. Its totient is φ = 635644800.

The previous prime is 1938742991. The next prime is 1938743041. The reversal of 1938742992 is 2992478391.

It is a super-2 number, since 2×1938742992² = 7517448778058224128, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938742991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10434 + ... + 63137.

It is an arithmetic number, because the mean of its divisors is an integer number (70702692).

Almost surely, 2^1938742992 is an apocalyptic number.

1938742992 is a gapful number since it is divisible by the number (12) 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 1938742992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2828107680).

1938742992 is an abundant number, since it is smaller than the sum of its proper divisors (3717472368).

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

1938742992 is a wasteful number, since it uses less digits than its factorization.

1938742992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73649 (or 73637 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 1938742992 is about 44031.1593306377. The cubic root of 1938742992 is about 1246.9242764403.

The spelling of 1938742992 in words is "one billion, nine hundred thirty-eight million, seven hundred forty-two thousand, nine hundred ninety-two".