1371978 has 28 divisors (see below), whose sum is σ = 3088818. Its totient is φ = 456840.

The previous prime is 1371949. The next prime is 1371989. The reversal of 1371978 is 8791731.

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 263169 = 1053^2 + 513^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 988 + ... + 1928.

2^1371978 is an apocalyptic number.

1371978 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 1371978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1544409).

1371978 is an abundant number, since it is smaller than the sum of its proper divisors (1716840).

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

1371978 is an frugal number, since it uses more digits than its factorization.

1371978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961 (or 946 counting only the distinct ones).

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

The square root of 1371978 is about 1171.3146460281. The cubic root of 1371978 is about 111.1174797090.

The spelling of 1371978 in words is "one million, three hundred seventy-one thousand, nine hundred seventy-eight".