1371780 has 36 divisors (see below), whose sum is σ = 4161612. Its totient is φ = 365760.

The previous prime is 1371779. The next prime is 1371803. The reversal of 1371780 is 871731.

It can be written as a sum of positive squares in 2 ways, for example, as 887364 + 484416 = 942^2 + 696^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3631 + ... + 3990.

2^1371780 is an apocalyptic number.

1371780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1371780 is an abundant number, since it is smaller than the sum of its proper divisors (2789832).

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

1371780 is a wasteful number, since it uses less digits than its factorization.

1371780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7636 (or 7631 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

The square root of 1371780 is about 1171.2301225635. The cubic root of 1371780 is about 111.1121340647.

The spelling of 1371780 in words is "one million, three hundred seventy-one thousand, seven hundred eighty".