99720142 has 8 divisors (see below), whose sum is σ = 149908896. Its totient is φ = 49750512.

The previous prime is 99720133. The next prime is 99720161. The reversal of 99720142 is 24102799.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 99720098 and 99720107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53638 + ... + 55465.

It is an arithmetic number, because the mean of its divisors is an integer number (18738612).

Almost surely, 2^99720142 is an apocalyptic number.

99720142 is a deficient number, since it is larger than the sum of its proper divisors (50188754).

99720142 is a wasteful number, since it uses less digits than its factorization.

99720142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109562.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 99720142 is about 9985.9972962143. The cubic root of 99720142 is about 463.7254835522.

The spelling of 99720142 in words is "ninety-nine million, seven hundred twenty thousand, one hundred forty-two".