1938018420 has 192 divisors, whose sum is σ = 6519744000. Its totient is φ = 475103232.

The previous prime is 1938018419. The next prime is 1938018421. The reversal of 1938018420 is 248108391.

It is an interprime number because it is at equal distance from previous prime (1938018419) and next prime (1938018421).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938018421) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2519796 + ... + 2520564.

It is an arithmetic number, because the mean of its divisors is an integer number (33957000).

Almost surely, 2^1938018420 is an apocalyptic number.

1938018420 is a gapful number since it is divisible by the number (10) 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 1938018420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3259872000).

1938018420 is an abundant number, since it is smaller than the sum of its proper divisors (4581725580).

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

1938018420 is a wasteful number, since it uses less digits than its factorization.

1938018420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159 (or 1151 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1938018420 is about 44022.9306157598. The cubic root of 1938018420 is about 1246.7689182179.

The spelling of 1938018420 in words is "one billion, nine hundred thirty-eight million, eighteen thousand, four hundred twenty".