40971818 has 4 divisors (see below), whose sum is σ = 61457730. Its totient is φ = 20485908.

The previous prime is 40971817. The next prime is 40971823. The reversal of 40971818 is 81817904.

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., 39476089 + 1495729 = 6283^2 + 1223^2 .

It is not an unprimeable number, because it can be changed into a prime (40971817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10242953 + ... + 10242956.

Almost surely, 2^40971818 is an apocalyptic number.

40971818 is a deficient number, since it is larger than the sum of its proper divisors (20485912).

40971818 is a wasteful number, since it uses less digits than its factorization.

40971818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20485911.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 40971818 is about 6400.9232146621. The cubic root of 40971818 is about 344.7426997031.

It can be divided in two parts, 409 and 71818, that added together give a palindrome (72227).

The spelling of 40971818 in words is "forty million, nine hundred seventy-one thousand, eight hundred eighteen".