42423890 has 16 divisors (see below), whose sum is σ = 77065560. Its totient is φ = 16813440.

The previous prime is 42423863. The next prime is 42423907. The reversal of 42423890 is 9832424.

It can be written as a sum of positive squares in 4 ways, for example, as 22648081 + 19775809 = 4759^2 + 4447^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18371 + ... + 20550.

Almost surely, 2^42423890 is an apocalyptic number.

42423890 is a deficient number, since it is larger than the sum of its proper divisors (34641670).

42423890 is a wasteful number, since it uses less digits than its factorization.

42423890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39037.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 42423890 is about 6513.3624189047. The cubic root of 42423890 is about 348.7681593641.

The spelling of 42423890 in words is "forty-two million, four hundred twenty-three thousand, eight hundred ninety".