1971764 has 12 divisors (see below), whose sum is σ = 3507588. Its totient is φ = 969600.

The previous prime is 1971727. The next prime is 1971799. The reversal of 1971764 is 4671791.

It can be written as a sum of positive squares in 2 ways, for example, as 302500 + 1669264 = 550^2 + 1292^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3797 + ... + 4284.

It is an arithmetic number, because the mean of its divisors is an integer number (292299).

2^1971764 is an apocalyptic number.

It is an amenable number.

1971764 is a deficient number, since it is larger than the sum of its proper divisors (1535824).

1971764 is a wasteful number, since it uses less digits than its factorization.

1971764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8146 (or 8144 counting only the distinct ones).

The product of its digits is 10584, while the sum is 35.

The square root of 1971764 is about 1404.1951431336. The cubic root of 1971764 is about 125.3963737741.

The spelling of 1971764 in words is "one million, nine hundred seventy-one thousand, seven hundred sixty-four".