84001807 has 4 divisors (see below), whose sum is σ = 84024720. Its totient is φ = 83978896.

The previous prime is 84001789. The next prime is 84001817. The reversal of 84001807 is 70810048.

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

It is a 4-Lehmer number, since φ(84001807) divides (84001807-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 84001807 - 2¹⁹ = 83477519 is a prime.

It is a deceptive number, since it divides R_84001806.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84001817) 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, 4582 + ... + 13747.

It is an arithmetic number, because the mean of its divisors is an integer number (21006180).

Almost surely, 2^84001807 is an apocalyptic number.

84001807 is the 4583-rd decagonal number.

84001807 is a deficient number, since it is larger than the sum of its proper divisors (22913).

84001807 is a wasteful number, since it uses less digits than its factorization.

84001807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22912.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 84001807 is about 9165.2499693134. The cubic root of 84001807 is about 437.9550543596.

The spelling of 84001807 in words is "eighty-four million, one thousand, eight hundred seven".