1971966407 has 4 divisors (see below), whose sum is σ = 1972119840. Its totient is φ = 1971812976.

The previous prime is 1971966401. The next prime is 1971966413. The reversal of 1971966407 is 7046691791.

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

It is an interprime number because it is at equal distance from previous prime (1971966401) and next prime (1971966413).

It is a cyclic number.

It is not a de Polignac number, because 1971966407 - 2⁸ = 1971966151 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 (1971966401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55478 + ... + 83795.

It is an arithmetic number, because the mean of its divisors is an integer number (493029960).

Almost surely, 2^1971966407 is an apocalyptic number.

1971966407 is a deficient number, since it is larger than the sum of its proper divisors (153433).

1971966407 is a wasteful number, since it uses less digits than its factorization.

1971966407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153432.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 1971966407 is about 44406.8283825810. The cubic root of 1971966407 is about 1254.0066438824.

The spelling of 1971966407 in words is "one billion, nine hundred seventy-one million, nine hundred sixty-six thousand, four hundred seven".