1971788 has 24 divisors (see below), whose sum is σ = 4247712. Its totient is φ = 779904.

The previous prime is 1971727. The next prime is 1971799. The reversal of 1971788 is 8871791.

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, 2345 + ... + 3072.

It is an arithmetic number, because the mean of its divisors is an integer number (176988).

2^1971788 is an apocalyptic number.

It is an amenable number.

1971788 is an abundant number, since it is smaller than the sum of its proper divisors (2275924).

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

1971788 is a wasteful number, since it uses less digits than its factorization.

1971788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5441 (or 5439 counting only the distinct ones).

The product of its digits is 28224, while the sum is 41.

The square root of 1971788 is about 1404.2036889284. The cubic root of 1971788 is about 125.3968825403.

The spelling of 1971788 in words is "one million, nine hundred seventy-one thousand, seven hundred eighty-eight".