42400066 has 8 divisors (see below), whose sum is σ = 63632700. Its totient is φ = 21189168.

The previous prime is 42400009. The next prime is 42400067. The reversal of 42400066 is 66000424.

It can be written as a sum of positive squares in 2 ways, for example, as 29648025 + 12752041 = 5445^2 + 3571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (42400067) 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, 940 + ... + 9256.

Almost surely, 2^42400066 is an apocalyptic number.

42400066 is a deficient number, since it is larger than the sum of its proper divisors (21232634).

42400066 is a wasteful number, since it uses less digits than its factorization.

42400066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10868.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 42400066 is about 6511.5333063726. The cubic root of 42400066 is about 348.7028611836.

The spelling of 42400066 in words is "forty-two million, four hundred thousand, sixty-six".