99940491 has 24 divisors (see below), whose sum is σ = 166293504. Its totient is φ = 56654640.

The previous prime is 99940429. The next prime is 99940499. The reversal of 99940491 is 19404999.

It is not a de Polignac number, because 99940491 - 2¹⁵ = 99907723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99940499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1756 + ... + 14246.

It is an arithmetic number, because the mean of its divisors is an integer number (6928896).

Almost surely, 2^99940491 is an apocalyptic number.

99940491 is a deficient number, since it is larger than the sum of its proper divisors (66353013).

99940491 is a wasteful number, since it uses less digits than its factorization.

99940491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12631 (or 12628 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 99940491 is about 9997.0241072031. The cubic root of 99940491 is about 464.0667929882.

Subtracting from 99940491 its product of nonzero digits (104976), we obtain a triangular number (99835515 = T₁₄₁₃₀).

The spelling of 99940491 in words is "ninety-nine million, nine hundred forty thousand, four hundred ninety-one".