99090439 has 4 divisors (see below), whose sum is σ = 113246224. Its totient is φ = 84934656.

The previous prime is 99090437. The next prime is 99090457. The reversal of 99090439 is 93409099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93409099 = 7 ⋅13344157.

It is a 20-Lehmer number, since φ(99090439) divides (99090439-1)²⁰.

It is a cyclic number.

It is not a de Polignac number, because 99090439 - 2¹ = 99090437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99090395 and 99090404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99090437) 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, 7077882 + ... + 7077895.

It is an arithmetic number, because the mean of its divisors is an integer number (28311556).

Almost surely, 2^99090439 is an apocalyptic number.

99090439 is a deficient number, since it is larger than the sum of its proper divisors (14155785).

99090439 is a wasteful number, since it uses less digits than its factorization.

99090439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14155784.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 99090439 is about 9954.4180643572. The cubic root of 99090439 is about 462.7473256182.

The spelling of 99090439 in words is "ninety-nine million, ninety thousand, four hundred thirty-nine".