40430042 has 4 divisors (see below), whose sum is σ = 60645066. Its totient is φ = 20215020.

The previous prime is 40430041. The next prime is 40430051. The reversal of 40430042 is 24003404.

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

It can be written as a sum of positive squares in only one way, i.e., 39325441 + 1104601 = 6271^2 + 1051^2 .

It is a super-2 number, since 2×40430042² = 3269176592243528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40430042.

It is not an unprimeable number, because it can be changed into a prime (40430041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107509 + ... + 10107512.

Almost surely, 2^40430042 is an apocalyptic number.

40430042 is a deficient number, since it is larger than the sum of its proper divisors (20215024).

40430042 is a wasteful number, since it uses less digits than its factorization.

40430042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20215023.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 40430042 is about 6358.4622354780. The cubic root of 40430042 is about 343.2164256714.

Adding to 40430042 its reverse (24003404), we get a palindrome (64433446).

The spelling of 40430042 in words is "forty million, four hundred thirty thousand, forty-two".