40539442 has 4 divisors (see below), whose sum is σ = 60809166. Its totient is φ = 20269720.

The previous prime is 40539439. The next prime is 40539463. The reversal of 40539442 is 24493504.

It is a happy number.

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., 32592681 + 7946761 = 5709^2 + 2819^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10134859 + ... + 10134862.

Almost surely, 2^40539442 is an apocalyptic number.

40539442 is a deficient number, since it is larger than the sum of its proper divisors (20269724).

40539442 is a wasteful number, since it uses less digits than its factorization.

40539442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20269723.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 40539442 is about 6367.0591327551. The cubic root of 40539442 is about 343.5257176309.

The spelling of 40539442 in words is "forty million, five hundred thirty-nine thousand, four hundred forty-two".