42406999 has 4 divisors (see below), whose sum is σ = 42441336. Its totient is φ = 42372664.

The previous prime is 42406967. The next prime is 42407003. The reversal of 42406999 is 99960424.

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 42406999 - 2⁵ = 42406967 is a prime.

It is a super-3 number, since 3×42406999³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42406919) 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, 15244 + ... + 17809.

It is an arithmetic number, because the mean of its divisors is an integer number (10610334).

Almost surely, 2^42406999 is an apocalyptic number.

42406999 is a deficient number, since it is larger than the sum of its proper divisors (34337).

42406999 is a wasteful number, since it uses less digits than its factorization.

42406999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34336.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 42406999 is about 6512.0656477035. The cubic root of 42406999 is about 348.7218660689.

The spelling of 42406999 in words is "forty-two million, four hundred six thousand, nine hundred ninety-nine".