99638140 has 24 divisors (see below), whose sum is σ = 239131872. Its totient is φ = 34161600.

The previous prime is 99638137. The next prime is 99638153. The reversal of 99638140 is 4183699.

It is a junction number, because it is equal to n+sod(n) for n = 99638093 and 99638102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355711 + ... + 355990.

It is an arithmetic number, because the mean of its divisors is an integer number (9963828).

Almost surely, 2^99638140 is an apocalyptic number.

It is an amenable number.

99638140 is an abundant number, since it is smaller than the sum of its proper divisors (139493732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99638140 is a wasteful number, since it uses less digits than its factorization.

99638140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711717 (or 711715 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 99638140 is about 9981.8906024861. The cubic root of 99638140 is about 463.5983382420.

The spelling of 99638140 in words is "ninety-nine million, six hundred thirty-eight thousand, one hundred forty".