99942019 has 4 divisors (see below), whose sum is σ = 102266296. Its totient is φ = 97617744.

The previous prime is 99941981. The next prime is 99942023. The reversal of 99942019 is 91024999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91024999 = 13 ⋅7001923.

It is a cyclic number.

It is not a de Polignac number, because 99942019 - 2¹⁷ = 99810947 is a prime.

It is a super-2 number, since 2×99942019² = 19976814323592722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 2324233 = 99942019 / (9 + 9 + 9 + 4 + 2 + 0 + 1 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99942119) by changing a digit.

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, 1162074 + ... + 1162159.

It is an arithmetic number, because the mean of its divisors is an integer number (25566574).

Almost surely, 2^99942019 is an apocalyptic number.

99942019 is a deficient number, since it is larger than the sum of its proper divisors (2324277).

99942019 is a wasteful number, since it uses less digits than its factorization.

99942019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324276.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 99942019 is about 9997.1005296536. The cubic root of 99942019 is about 464.0691580304.

The spelling of 99942019 in words is "ninety-nine million, nine hundred forty-two thousand, nineteen".