1978368 has 104 divisors (see below), whose sum is σ = 6290688. Its totient is φ = 540672.

The previous prime is 1978363. The next prime is 1978393. The reversal of 1978368 is 8638791.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 8.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1978363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86005 + ... + 86027.

2^1978368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3145344).

1978368 is an abundant number, since it is smaller than the sum of its proper divisors (4312320).

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

1978368 is an equidigital number, since it uses as much as digits as its factorization.

1978368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57 (or 35 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 1978368 is about 1406.5447024535. The cubic root of 1978368 is about 125.5362138420.

It can be divided in two parts, 1978 and 368, that added together give a triangular number (2346 = T₆₈).

The spelling of 1978368 in words is "one million, nine hundred seventy-eight thousand, three hundred sixty-eight".