42478999 has 4 divisors (see below), whose sum is σ = 44325936. Its totient is φ = 40632064.

The previous prime is 42478991. The next prime is 42479009. The reversal of 42478999 is 99987424.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42478999 - 2³ = 42478991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42478991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 923434 + ... + 923479.

It is an arithmetic number, because the mean of its divisors is an integer number (11081484).

Almost surely, 2^42478999 is an apocalyptic number.

42478999 is a deficient number, since it is larger than the sum of its proper divisors (1846937).

42478999 is a wasteful number, since it uses less digits than its factorization.

42478999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846936.

The product of its digits is 1306368, while the sum is 52.

The square root of 42478999 is about 6517.5915030017. The cubic root of 42478999 is about 348.9191116386.

The spelling of 42478999 in words is "forty-two million, four hundred seventy-eight thousand, nine hundred ninety-nine".