99291390 has 96 divisors (see below), whose sum is σ = 277512480. Its totient is φ = 22640640.

The previous prime is 99291371. The next prime is 99291433. The reversal of 99291390 is 9319299.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60906 + ... + 62514.

It is an arithmetic number, because the mean of its divisors is an integer number (2890755).

Almost surely, 2^99291390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99291390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138756240).

99291390 is an abundant number, since it is smaller than the sum of its proper divisors (178221090).

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

99291390 is a wasteful number, since it uses less digits than its factorization.

99291390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658 (or 1647 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 99291390 is about 9964.5065106105. The cubic root of 99291390 is about 463.0599247278.

It can be divided in two parts, 99291 and 390, that added together give a triangular number (99681 = T₄₄₆).

The spelling of 99291390 in words is "ninety-nine million, two hundred ninety-one thousand, three hundred ninety".