84540919 has 4 divisors (see below), whose sum is σ = 85158144. Its totient is φ = 83923696.

The previous prime is 84540917. The next prime is 84540931. The reversal of 84540919 is 91904548.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84540919 - 2¹ = 84540917 is a prime.

It is a super-2 number, since 2×84540919² = 14294333970729122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84540917) 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, 308407 + ... + 308680.

It is an arithmetic number, because the mean of its divisors is an integer number (21289536).

Almost surely, 2^84540919 is an apocalyptic number.

84540919 is a deficient number, since it is larger than the sum of its proper divisors (617225).

84540919 is a wasteful number, since it uses less digits than its factorization.

84540919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617224.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 84540919 is about 9194.6135862254. The cubic root of 84540919 is about 438.8899688437.

The spelling of 84540919 in words is "eighty-four million, five hundred forty thousand, nine hundred nineteen".