99940405 has 16 divisors (see below), whose sum is σ = 125527680. Its totient is φ = 76241088.

The previous prime is 99940369. The next prime is 99940429. The reversal of 99940405 is 50404999.

It is a cyclic number.

It is not a de Polignac number, because 99940405 - 2⁹ = 99939893 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42439 + ... + 44731.

It is an arithmetic number, because the mean of its divisors is an integer number (7845480).

Almost surely, 2^99940405 is an apocalyptic number.

It is an amenable number.

99940405 is a deficient number, since it is larger than the sum of its proper divisors (25587275).

99940405 is a wasteful number, since it uses less digits than its factorization.

99940405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 99940405 is about 9997.0198059222. The cubic root of 99940405 is about 464.0666598765.

The spelling of 99940405 in words is "ninety-nine million, nine hundred forty thousand, four hundred five".