99637409 has 4 divisors (see below), whose sum is σ = 100624020. Its totient is φ = 98650800.

The previous prime is 99637399. The next prime is 99637429. The reversal of 99637409 is 90473699.

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

It can be written as a sum of positive squares in 2 ways, for example, as 62853184 + 36784225 = 7928^2 + 6065^2 .

It is a cyclic number.

It is not a de Polignac number, because 99637409 - 2⁴ = 99637393 is a prime.

It is a super-2 number, since 2×99637409² = 19855226544466562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99637429) 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, 493154 + ... + 493355.

It is an arithmetic number, because the mean of its divisors is an integer number (25156005).

Almost surely, 2^99637409 is an apocalyptic number.

It is an amenable number.

99637409 is a deficient number, since it is larger than the sum of its proper divisors (986611).

99637409 is a wasteful number, since it uses less digits than its factorization.

99637409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986610.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 99637409 is about 9981.8539861090. The cubic root of 99637409 is about 463.5972045020.

The spelling of 99637409 in words is "ninety-nine million, six hundred thirty-seven thousand, four hundred nine".