1971378 has 40 divisors (see below), whose sum is σ = 4536048. Its totient is φ = 639576.

The previous prime is 1971377. The next prime is 1971401. The reversal of 1971378 is 8731791.

It is not an unprimeable number, because it can be changed into a prime (1971377) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6825 + ... + 7107.

2^1971378 is an apocalyptic number.

1971378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1971378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2268024).

1971378 is an abundant number, since it is smaller than the sum of its proper divisors (2564670).

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

1971378 is a wasteful number, since it uses less digits than its factorization.

1971378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 331 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 1971378 is about 1404.0576911224. The cubic root of 1971378 is about 125.3881905502.

It can be divided in two parts, 19713 and 78, that added together give a palindrome (19791).

The spelling of 1971378 in words is "one million, nine hundred seventy-one thousand, three hundred seventy-eight".