42199989 has 16 divisors (see below), whose sum is σ = 60712512. Its totient is φ = 25918848.

The previous prime is 42199987. The next prime is 42199999. The reversal of 42199989 is 98999124.

It is a happy number.

It is not a de Polignac number, because 42199989 - 2¹ = 42199987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42199987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34777 + ... + 35969.

It is an arithmetic number, because the mean of its divisors is an integer number (3794532).

Almost surely, 2^42199989 is an apocalyptic number.

It is an amenable number.

42199989 is a deficient number, since it is larger than the sum of its proper divisors (18512523).

42199989 is a wasteful number, since it uses less digits than its factorization.

42199989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116.

The product of its digits is 419904, while the sum is 51.

The square root of 42199989 is about 6496.1518609097. The cubic root of 42199989 is about 348.1535110149.

The spelling of 42199989 in words is "forty-two million, one hundred ninety-nine thousand, nine hundred eighty-nine".