99943640 has 32 divisors (see below), whose sum is σ = 228690000. Its totient is φ = 39298944.

The previous prime is 99943639. The next prime is 99943661. The reversal of 99943640 is 4634999.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 99943591 and 99943600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18815 + ... + 23534.

Almost surely, 2^99943640 is an apocalyptic number.

It is an amenable number.

99943640 is an abundant number, since it is smaller than the sum of its proper divisors (128746360).

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

99943640 is a wasteful number, since it uses less digits than its factorization.

99943640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42419 (or 42415 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 99943640 is about 9997.1816028319. The cubic root of 99943640 is about 464.0716669920.

The spelling of 99943640 in words is "ninety-nine million, nine hundred forty-three thousand, six hundred forty".