1971959 has 4 divisors (see below), whose sum is σ = 2151240. Its totient is φ = 1792680.

The previous prime is 1971911. The next prime is 1971967. The reversal of 1971959 is 9591791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1971959 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 (1971659) 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, 89624 + ... + 89645.

It is an arithmetic number, because the mean of its divisors is an integer number (537810).

2^1971959 is an apocalyptic number.

1971959 is a deficient number, since it is larger than the sum of its proper divisors (179281).

1971959 is a wasteful number, since it uses less digits than its factorization.

1971959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179280.

The product of its digits is 25515, while the sum is 41.

The square root of 1971959 is about 1404.2645762106. The cubic root of 1971959 is about 125.4005073802.

The spelling of 1971959 in words is "one million, nine hundred seventy-one thousand, nine hundred fifty-nine".