1971839 has 8 divisors (see below), whose sum is σ = 2112000. Its totient is φ = 1835352.

The previous prime is 1971833. The next prime is 1971857. The reversal of 1971839 is 9381791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1971839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242 + ... + 2000.

It is an arithmetic number, because the mean of its divisors is an integer number (264000).

2^1971839 is an apocalyptic number.

1971839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1971839 is a deficient number, since it is larger than the sum of its proper divisors (140161).

1971839 is a wasteful number, since it uses less digits than its factorization.

1971839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837.

The product of its digits is 13608, while the sum is 38.

The square root of 1971839 is about 1404.2218485695. The cubic root of 1971839 is about 125.3979636548.

The spelling of 1971839 in words is "one million, nine hundred seventy-one thousand, eight hundred thirty-nine".