84747421 has 4 divisors (see below), whose sum is σ = 92451744. Its totient is φ = 77043100.

The previous prime is 84747419. The next prime is 84747461. The reversal of 84747421 is 12474748.

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 84747421 - 2¹ = 84747419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84747461) 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, 3852145 + ... + 3852166.

It is an arithmetic number, because the mean of its divisors is an integer number (23112936).

Almost surely, 2^84747421 is an apocalyptic number.

It is an amenable number.

84747421 is a deficient number, since it is larger than the sum of its proper divisors (7704323).

84747421 is a wasteful number, since it uses less digits than its factorization.

84747421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7704322.

The product of its digits is 50176, while the sum is 37.

The square root of 84747421 is about 9205.8362466427. The cubic root of 84747421 is about 439.2470265631.

The spelling of 84747421 in words is "eighty-four million, seven hundred forty-seven thousand, four hundred twenty-one".