99191490 has 64 divisors (see below), whose sum is σ = 245877120. Its totient is φ = 25597440.

The previous prime is 99191483. The next prime is 99191507. The reversal of 99191490 is 9419199.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 122206 + ... + 123014.

It is an arithmetic number, because the mean of its divisors is an integer number (3841830).

Almost surely, 2^99191490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99191490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122938560).

99191490 is an abundant number, since it is smaller than the sum of its proper divisors (146685630).

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

99191490 is a wasteful number, since it uses less digits than its factorization.

99191490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947.

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 99191490 is about 9959.4924569478. The cubic root of 99191490 is about 462.9045731927.

It can be divided in two parts, 99191 and 490, that added together give a triangular number (99681 = T₄₄₆).

The spelling of 99191490 in words is "ninety-nine million, one hundred ninety-one thousand, four hundred ninety".