99943956 has 144 divisors (see below), whose sum is σ = 308287616. Its totient is φ = 27713664.

The previous prime is 99943913. The next prime is 99943979. The reversal of 99943956 is 65934999.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 251550 + ... + 251946.

Almost surely, 2^99943956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99943956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154143808).

99943956 is an abundant number, since it is smaller than the sum of its proper divisors (208343660).

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

99943956 is a wasteful number, since it uses less digits than its factorization.

99943956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 446 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 54.

The square root of 99943956 is about 9997.1974072737. The cubic root of 99943956 is about 464.0721560893.

The spelling of 99943956 in words is "ninety-nine million, nine hundred forty-three thousand, nine hundred fifty-six".