1938378312 has 96 divisors (see below), whose sum is σ = 5663057400. Its totient is φ = 595427328.

The previous prime is 1938378307. The next prime is 1938378317. The reversal of 1938378312 is 2138738391.

It is a happy number.

1938378312 is a `hidden beast` number, since 193 + 83 + 78 + 312 = 666.

It is an interprime number because it is at equal distance from previous prime (1938378307) and next prime (1938378317).

It can be written as a sum of positive squares in 4 ways, for example, as 1156952196 + 781426116 = 34014^2 + 27954^2 .

It is not an unprimeable number, because it can be changed into a prime (1938378317) 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, 718438 + ... + 721130.

Almost surely, 2^1938378312 is an apocalyptic number.

1938378312 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 1938378312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2831528700).

1938378312 is an abundant number, since it is smaller than the sum of its proper divisors (3724679088).

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

1938378312 is a wasteful number, since it uses less digits than its factorization.

1938378312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3487 (or 3480 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1938378312 is about 44027.0179776010. The cubic root of 1938378312 is about 1246.8460888617.

The spelling of 1938378312 in words is "one billion, nine hundred thirty-eight million, three hundred seventy-eight thousand, three hundred twelve".