83945647 has 2 divisors, whose sum is σ = 83945648. Its totient is φ = 83945646.

The previous prime is 83945639. The next prime is 83945663. The reversal of 83945647 is 74654938.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83945647 - 2³ = 83945639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 83945597 and 83945606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83945627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41972823 + 41972824.

It is an arithmetic number, because the mean of its divisors is an integer number (41972824).

Almost surely, 2^83945647 is an apocalyptic number.

83945647 is a deficient number, since it is larger than the sum of its proper divisors (1).

83945647 is an equidigital number, since it uses as much as digits as its factorization.

83945647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 46.

The square root of 83945647 is about 9162.1857108443. The cubic root of 83945647 is about 437.8574332887.

It can be divided in two parts, 8394 and 5647, that added together give a palindrome (14041).

The spelling of 83945647 in words is "eighty-three million, nine hundred forty-five thousand, six hundred forty-seven".