83439899 has 4 divisors (see below), whose sum is σ = 85215264. Its totient is φ = 81664536.

The previous prime is 83439877. The next prime is 83439907. The reversal of 83439899 is 99893438.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99893438 = 2 ⋅49946719.

It is a cyclic number.

It is not a de Polignac number, because 83439899 - 2¹⁶ = 83374363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83439899.

It is not an unprimeable number, because it can be changed into a prime (83439809) 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, 887612 + ... + 887705.

It is an arithmetic number, because the mean of its divisors is an integer number (21303816).

Almost surely, 2^83439899 is an apocalyptic number.

83439899 is a deficient number, since it is larger than the sum of its proper divisors (1775365).

83439899 is a wasteful number, since it uses less digits than its factorization.

83439899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775364.

The product of its digits is 1679616, while the sum is 53.

The square root of 83439899 is about 9134.5442688730. The cubic root of 83439899 is about 436.9763404290.

The spelling of 83439899 in words is "eighty-three million, four hundred thirty-nine thousand, eight hundred ninety-nine".