83865813 has 8 divisors (see below), whose sum is σ = 114200448. Its totient is φ = 54720864.

The previous prime is 83865737. The next prime is 83865823. The reversal of 83865813 is 31856838.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 83865813 - 2¹⁸ = 83603669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83865823) 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 7 ways as a sum of consecutive naturals, for example, 297256 + ... + 297537.

It is an arithmetic number, because the mean of its divisors is an integer number (14275056).

Almost surely, 2^83865813 is an apocalyptic number.

It is an amenable number.

83865813 is a deficient number, since it is larger than the sum of its proper divisors (30334635).

83865813 is a wasteful number, since it uses less digits than its factorization.

83865813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594843.

The product of its digits is 138240, while the sum is 42.

The square root of 83865813 is about 9157.8279630052. The cubic root of 83865813 is about 437.7185855195.

The spelling of 83865813 in words is "eighty-three million, eight hundred sixty-five thousand, eight hundred thirteen".