42684399 has 24 divisors (see below), whose sum is σ = 65622960. Its totient is φ = 26642688.

The previous prime is 42684377. The next prime is 42684401. The reversal of 42684399 is 99348624.

It is not a de Polignac number, because 42684399 - 2⁹ = 42683887 is a prime.

It is a super-3 number, since 3×42684399³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42684329) 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 23 ways as a sum of consecutive naturals, for example, 34117 + ... + 35345.

It is an arithmetic number, because the mean of its divisors is an integer number (2734290).

Almost surely, 2^42684399 is an apocalyptic number.

42684399 is a deficient number, since it is larger than the sum of its proper divisors (22938561).

42684399 is a wasteful number, since it uses less digits than its factorization.

42684399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479 (or 1476 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 42684399 is about 6533.3298554413. The cubic root of 42684399 is about 349.4805873774.

The spelling of 42684399 in words is "forty-two million, six hundred eighty-four thousand, three hundred ninety-nine".