42199779 has 16 divisors (see below), whose sum is σ = 61804800. Its totient is φ = 25492896.

The previous prime is 42199771. The next prime is 42199811. The reversal of 42199779 is 97799124.

It is a happy number.

It is not a de Polignac number, because 42199779 - 2³ = 42199771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42199771) 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, 14784 + ... + 17405.

It is an arithmetic number, because the mean of its divisors is an integer number (3862800).

Almost surely, 2^42199779 is an apocalyptic number.

42199779 is a deficient number, since it is larger than the sum of its proper divisors (19605021).

42199779 is a wasteful number, since it uses less digits than its factorization.

42199779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32234.

The product of its digits is 285768, while the sum is 48.

The square root of 42199779 is about 6496.1356974743. The cubic root of 42199779 is about 348.1529335080.

The spelling of 42199779 in words is "forty-two million, one hundred ninety-nine thousand, seven hundred seventy-nine".