99491140 has 72 divisors (see below), whose sum is σ = 253753920. Its totient is φ = 32091648.

The previous prime is 99491071. The next prime is 99491173. The reversal of 99491140 is 4119499.

99491140 = T₂ + T₃ + ... + T₈₄₁.

It is a self number, because there is not a number n which added to its sum of digits gives 99491140.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39231 + ... + 41689.

It is an arithmetic number, because the mean of its divisors is an integer number (3524360).

Almost surely, 2^99491140 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 99491140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126876960).

99491140 is an abundant number, since it is smaller than the sum of its proper divisors (154262780).

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

99491140 is a wasteful number, since it uses less digits than its factorization.

99491140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509 (or 2490 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 99491140 is about 9974.5245500725. The cubic root of 99491140 is about 463.3702378463.

The spelling of 99491140 in words is "ninety-nine million, four hundred ninety-one thousand, one hundred forty".