42930819 has 12 divisors (see below), whose sum is σ = 63063000. Its totient is φ = 28135104.

The previous prime is 42930809. The next prime is 42930827. The reversal of 42930819 is 91803924.

42930819 = 865² + 866² + ... + 918².

It is not a de Polignac number, because 42930819 - 2⁴ = 42930803 is a prime.

It is a super-2 number, since 2×42930819² = 3686110440021522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42930809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39894 + ... + 40955.

It is an arithmetic number, because the mean of its divisors is an integer number (5255250).

Almost surely, 2^42930819 is an apocalyptic number.

42930819 is a deficient number, since it is larger than the sum of its proper divisors (20132181).

42930819 is a wasteful number, since it uses less digits than its factorization.

42930819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80914 (or 80911 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 42930819 is about 6552.1613991110. The cubic root of 42930819 is about 350.1518225684.

The spelling of 42930819 in words is "forty-two million, nine hundred thirty thousand, eight hundred nineteen".