1938768390 has 48 divisors (see below), whose sum is σ = 5428554768. Its totient is φ = 477235008.

The previous prime is 1938768389. The next prime is 1938768397. The reversal of 1938768390 is 938678391.

1938768390 is a `hidden beast` number, since 193 + 8 + 7 + 68 + 390 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938768397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 827364 + ... + 829703.

It is an arithmetic number, because the mean of its divisors is an integer number (113094891).

Almost surely, 2^1938768390 is an apocalyptic number.

1938768390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1938768390 is an abundant number, since it is smaller than the sum of its proper divisors (3489786378).

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

1938768390 is a wasteful number, since it uses less digits than its factorization.

1938768390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657093 (or 1657090 counting only the distinct ones).

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

The square root of 1938768390 is about 44031.4477390876. The cubic root of 1938768390 is about 1246.9297214192.

The spelling of 1938768390 in words is "one billion, nine hundred thirty-eight million, seven hundred sixty-eight thousand, three hundred ninety".