99943957 has 4 divisors (see below), whose sum is σ = 99971820. Its totient is φ = 99916096.

The previous prime is 99943913. The next prime is 99943979. The reversal of 99943957 is 75934999.

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 96707556 + 3236401 = 9834^2 + 1799^2 .

It is a cyclic number.

It is not a de Polignac number, because 99943957 - 2¹¹ = 99941909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99943898 and 99943907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99943057) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7588 + ... + 16045.

It is an arithmetic number, because the mean of its divisors is an integer number (24992955).

Almost surely, 2^99943957 is an apocalyptic number.

It is an amenable number.

99943957 is a deficient number, since it is larger than the sum of its proper divisors (27863).

99943957 is a wasteful number, since it uses less digits than its factorization.

99943957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27862.

The product of its digits is 2755620, while the sum is 55.

The square root of 99943957 is about 9997.1974572877. The cubic root of 99943957 is about 464.0721576370.

The spelling of 99943957 in words is "ninety-nine million, nine hundred forty-three thousand, nine hundred fifty-seven".