1978580 has 12 divisors (see below), whose sum is σ = 4155060. Its totient is φ = 791424.

The previous prime is 1978567. The next prime is 1978589. The reversal of 1978580 is 858791.

It can be written as a sum of positive squares in 2 ways, for example, as 470596 + 1507984 = 686^2 + 1228^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49445 + ... + 49484.

It is an arithmetic number, because the mean of its divisors is an integer number (346255).

2^1978580 is an apocalyptic number.

1978580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978580 is an abundant number, since it is smaller than the sum of its proper divisors (2176480).

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

1978580 is a wasteful number, since it uses less digits than its factorization.

1978580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98938 (or 98936 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1978580 is about 1406.6200624191. The cubic root of 1978580 is about 125.5406977949.

The spelling of 1978580 in words is "one million, nine hundred seventy-eight thousand, five hundred eighty".