40042663 has 4 divisors (see below), whose sum is σ = 40079880. Its totient is φ = 40005448.

The previous prime is 40042661. The next prime is 40042679. The reversal of 40042663 is 36624004.

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 40042663 - 2¹ = 40042661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042661) 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, 16945 + ... + 19162.

It is an arithmetic number, because the mean of its divisors is an integer number (10019970).

Almost surely, 2^40042663 is an apocalyptic number.

40042663 is a deficient number, since it is larger than the sum of its proper divisors (37217).

40042663 is a wasteful number, since it uses less digits than its factorization.

40042663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37216.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 40042663 is about 6327.9272277737. The cubic root of 40042663 is about 342.1167339731.

Adding to 40042663 its reverse (36624004), we get a palindrome (76666667).

The spelling of 40042663 in words is "forty million, forty-two thousand, six hundred sixty-three".