40442947 has 4 divisors (see below), whose sum is σ = 42201360. Its totient is φ = 38684536.

The previous prime is 40442929. The next prime is 40442951. The reversal of 40442947 is 74924404.

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 40442947 - 2⁷ = 40442819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40442917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879172 + ... + 879217.

It is an arithmetic number, because the mean of its divisors is an integer number (10550340).

Almost surely, 2^40442947 is an apocalyptic number.

40442947 is a deficient number, since it is larger than the sum of its proper divisors (1758413).

40442947 is a wasteful number, since it uses less digits than its factorization.

40442947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758412.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 40442947 is about 6359.4769439003. The cubic root of 40442947 is about 343.2529392520.

The spelling of 40442947 in words is "forty million, four hundred forty-two thousand, nine hundred forty-seven".