1971380 has 24 divisors (see below), whose sum is σ = 4167240. Its totient is φ = 783360.

The previous prime is 1971377. The next prime is 1971401. The reversal of 1971380 is 831791.

It can be written as a sum of positive squares in 4 ways, for example, as 813604 + 1157776 = 902^2 + 1076^2 .

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4616 + ... + 5024.

It is an arithmetic number, because the mean of its divisors is an integer number (173635).

2^1971380 is an apocalyptic number.

1971380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1971380 is an abundant number, since it is smaller than the sum of its proper divisors (2195860).

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

1971380 is a wasteful number, since it uses less digits than its factorization.

1971380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1971380 is about 1404.0584033437. The cubic root of 1971380 is about 125.3882329530.

The spelling of 1971380 in words is "one million, nine hundred seventy-one thousand, three hundred eighty".