99727409 has 4 divisors (see below), whose sum is σ = 104976240. Its totient is φ = 94478580.

The previous prime is 99727387. The next prime is 99727451. The reversal of 99727409 is 90472799.

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 99727409 - 2²⁴ = 82950193 is a prime.

It is a super-2 number, since 2×99727409² = 19891112211706562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99727489) 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, 2624387 + ... + 2624424.

It is an arithmetic number, because the mean of its divisors is an integer number (26244060).

Almost surely, 2^99727409 is an apocalyptic number.

It is an amenable number.

99727409 is a deficient number, since it is larger than the sum of its proper divisors (5248831).

99727409 is a wasteful number, since it uses less digits than its factorization.

99727409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5248830.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 99727409 is about 9986.3611490873. The cubic root of 99727409 is about 463.7367477802.

The spelling of 99727409 in words is "ninety-nine million, seven hundred twenty-seven thousand, four hundred nine".