99406639 has 4 divisors (see below), whose sum is σ = 100371856. Its totient is φ = 98441424.

The previous prime is 99406631. The next prime is 99406649. The reversal of 99406639 is 93660499.

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

It is a cyclic number.

It is not a de Polignac number, because 99406639 - 2³ = 99406631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99406631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482454 + ... + 482659.

It is an arithmetic number, because the mean of its divisors is an integer number (25092964).

Almost surely, 2^99406639 is an apocalyptic number.

99406639 is a deficient number, since it is larger than the sum of its proper divisors (965217).

99406639 is a wasteful number, since it uses less digits than its factorization.

99406639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965216.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 99406639 is about 9970.2878092861. The cubic root of 99406639 is about 463.2390156457.

The spelling of 99406639 in words is "ninety-nine million, four hundred six thousand, six hundred thirty-nine".