84747391 has 16 divisors (see below), whose sum is σ = 90956800. Its totient is φ = 78732000.

The previous prime is 84747373. The next prime is 84747407. The reversal of 84747391 is 19374748.

It is a 9-Lehmer number, since φ(84747391) divides (84747391-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 84747391 - 2²³ = 76358783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84747301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312586 + ... + 312856.

It is an arithmetic number, because the mean of its divisors is an integer number (5684800).

Almost surely, 2^84747391 is an apocalyptic number.

84747391 is a deficient number, since it is larger than the sum of its proper divisors (6209409).

84747391 is a wasteful number, since it uses less digits than its factorization.

84747391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550.

The product of its digits is 169344, while the sum is 43.

The square root of 84747391 is about 9205.8346172414. The cubic root of 84747391 is about 439.2469747329.

The spelling of 84747391 in words is "eighty-four million, seven hundred forty-seven thousand, three hundred ninety-one".