84057217 has 4 divisors (see below), whose sum is σ = 86012080. Its totient is φ = 82102356.

The previous prime is 84057209. The next prime is 84057227. The reversal of 84057217 is 71275048.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84057217 - 2³ = 84057209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84057227) 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, 977367 + ... + 977452.

It is an arithmetic number, because the mean of its divisors is an integer number (21503020).

Almost surely, 2^84057217 is an apocalyptic number.

It is an amenable number.

84057217 is a deficient number, since it is larger than the sum of its proper divisors (1954863).

84057217 is a wasteful number, since it uses less digits than its factorization.

84057217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954862.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 84057217 is about 9168.2723018026. The cubic root of 84057217 is about 438.0513290971.

The spelling of 84057217 in words is "eighty-four million, fifty-seven thousand, two hundred seventeen".