83870391 has 8 divisors (see below), whose sum is σ = 121993344. Its totient is φ = 50830520.

The previous prime is 83870387. The next prime is 83870393. The reversal of 83870391 is 19307838.

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

It is a cyclic number.

It is not a de Polignac number, because 83870391 - 2² = 83870387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83870393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1270731 + ... + 1270796.

It is an arithmetic number, because the mean of its divisors is an integer number (15249168).

Almost surely, 2^83870391 is an apocalyptic number.

83870391 is a deficient number, since it is larger than the sum of its proper divisors (38122953).

83870391 is a wasteful number, since it uses less digits than its factorization.

83870391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541541.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 83870391 is about 9158.0779096926. The cubic root of 83870391 is about 437.7265499854.

The spelling of 83870391 in words is "eighty-three million, eight hundred seventy thousand, three hundred ninety-one".