84237409 has 4 divisors (see below), whose sum is σ = 84259120. Its totient is φ = 84215700.

The previous prime is 84237407. The next prime is 84237443. The reversal of 84237409 is 90473248.

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 84237409 - 2¹ = 84237407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84237407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3267 + ... + 13384.

It is an arithmetic number, because the mean of its divisors is an integer number (21064780).

Almost surely, 2^84237409 is an apocalyptic number.

It is an amenable number.

84237409 is a deficient number, since it is larger than the sum of its proper divisors (21711).

84237409 is a wasteful number, since it uses less digits than its factorization.

84237409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21710.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 84237409 is about 9178.0939742411. The cubic root of 84237409 is about 438.3641200439.

The spelling of 84237409 in words is "eighty-four million, two hundred thirty-seven thousand, four hundred nine".