1938978 has 20 divisors (see below), whose sum is σ = 4345110. Its totient is φ = 646272.

The previous prime is 1938977. The next prime is 1938983. The reversal of 1938978 is 8798391.

It can be written as a sum of positive squares in only one way, i.e., 1896129 + 42849 = 1377^2 + 207^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938971) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5823 + ... + 6146.

2^1938978 is an apocalyptic number.

1938978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1938978 is an abundant number, since it is smaller than the sum of its proper divisors (2406132).

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

1938978 is a wasteful number, since it uses less digits than its factorization.

1938978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11983 (or 11974 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1938978 is about 1392.4719027686. The cubic root of 1938978 is about 124.6974657081.

It can be divided in two parts, 1938 and 978, that added together give a square (2916 = 54²).

The spelling of 1938978 in words is "one million, nine hundred thirty-eight thousand, nine hundred seventy-eight".