99142890 has 128 divisors (see below), whose sum is σ = 299593728. Its totient is φ = 20398080.

The previous prime is 99142889. The next prime is 99142891. The reversal of 99142890 is 9824199.

It is an interprime number because it is at equal distance from previous prime (99142889) and next prime (99142891).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (99142891) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 385642 + ... + 385898.

It is an arithmetic number, because the mean of its divisors is an integer number (2340576).

Almost surely, 2^99142890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99142890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149796864).

99142890 is an abundant number, since it is smaller than the sum of its proper divisors (200450838).

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

99142890 is a wasteful number, since it uses less digits than its factorization.

99142890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 99142890 is about 9957.0522746443. The cubic root of 99142890 is about 462.8289590532.

The spelling of 99142890 in words is "ninety-nine million, one hundred forty-two thousand, eight hundred ninety".