1972842156397 has 16 divisors (see below), whose sum is σ = 2317359362560. Its totient is φ = 1644064501248.

The previous prime is 1972842156371. The next prime is 1972842156403. The reversal of 1972842156397 is 7936512482791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1972842156397 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 (1972842156347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2526372 + ... + 3213757.

It is an arithmetic number, because the mean of its divisors is an integer number (144834960160).

Almost surely, 2^{1972842156397} is an apocalyptic number.

It is an amenable number.

1972842156397 is a deficient number, since it is larger than the sum of its proper divisors (344517206163).

1972842156397 is a wasteful number, since it uses less digits than its factorization.

1972842156397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5741500.

The product of its digits is 45722880, while the sum is 64.

The spelling of 1972842156397 in words is "one trillion, nine hundred seventy-two billion, eight hundred forty-two million, one hundred fifty-six thousand, three hundred ninety-seven".