99940638 has 32 divisors (see below), whose sum is σ = 229455360. Its totient is φ = 28427040.

The previous prime is 99940597. The next prime is 99940639. The reversal of 99940638 is 83604999.

It is a happy number.

It is a super-2 number, since 2×99940638² = 19976262247694088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99940639) 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 15 ways as a sum of consecutive naturals, for example, 4423 + ... + 14813.

It is an arithmetic number, because the mean of its divisors is an integer number (7170480).

Almost surely, 2^99940638 is an apocalyptic number.

99940638 is an abundant number, since it is smaller than the sum of its proper divisors (129514722).

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

99940638 is a wasteful number, since it uses less digits than its factorization.

99940638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10632.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 99940638 is about 9997.0314593883. The cubic root of 99940638 is about 464.0670205162.

The spelling of 99940638 in words is "ninety-nine million, nine hundred forty thousand, six hundred thirty-eight".