82972387 has 4 divisors (see below), whose sum is σ = 83605896. Its totient is φ = 82338880.

The previous prime is 82972369. The next prime is 82972403. The reversal of 82972387 is 78327928.

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-82972387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82972987) 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, 316558 + ... + 316819.

It is an arithmetic number, because the mean of its divisors is an integer number (20901474).

Almost surely, 2^82972387 is an apocalyptic number.

82972387 is a deficient number, since it is larger than the sum of its proper divisors (633509).

82972387 is a wasteful number, since it uses less digits than its factorization.

82972387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633508.

The product of its digits is 338688, while the sum is 46.

The square root of 82972387 is about 9108.9179928244. The cubic root of 82972387 is about 436.1586883434.

The spelling of 82972387 in words is "eighty-two million, nine hundred seventy-two thousand, three hundred eighty-seven".