1978938 has 32 divisors (see below), whose sum is σ = 4737600. Its totient is φ = 608688.

The previous prime is 1978927. The next prime is 1978981. The reversal of 1978938 is 8398791.

It is a junction number, because it is equal to n+sod(n) for n = 1978893 and 1978902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 708 + ... + 2111.

It is an arithmetic number, because the mean of its divisors is an integer number (148050).

2^1978938 is an apocalyptic number.

1978938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1978938 is an abundant number, since it is smaller than the sum of its proper divisors (2758662).

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

1978938 is a wasteful number, since it uses less digits than its factorization.

1978938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2843 (or 2837 counting only the distinct ones).

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

The square root of 1978938 is about 1406.7473120643. The cubic root of 1978938 is about 125.5482690260.

Adding to 1978938 its product of digits (108864), we get a palindrome (2087802).

It can be divided in two parts, 1978 and 938, that added together give a square (2916 = 54²).

The spelling of 1978938 in words is "one million, nine hundred seventy-eight thousand, nine hundred thirty-eight".