83878421 has 8 divisors (see below), whose sum is σ = 91580544. Its totient is φ = 76189120.

The previous prime is 83878397. The next prime is 83878429. The reversal of 83878421 is 12487838.

83878421 is nontrivially palindromic in base 14.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83878421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83878429) 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, 15005 + ... + 19821.

It is an arithmetic number, because the mean of its divisors is an integer number (11447568).

Almost surely, 2^83878421 is an apocalyptic number.

It is an amenable number.

83878421 is a deficient number, since it is larger than the sum of its proper divisors (7702123).

83878421 is a wasteful number, since it uses less digits than its factorization.

83878421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6411.

The product of its digits is 86016, while the sum is 41.

The square root of 83878421 is about 9158.5163099707. The cubic root of 83878421 is about 437.7405192857.

The spelling of 83878421 in words is "eighty-three million, eight hundred seventy-eight thousand, four hundred twenty-one".