40668137 has 4 divisors (see below), whose sum is σ = 40740180. Its totient is φ = 40596096.

The previous prime is 40668109. The next prime is 40668167. The reversal of 40668137 is 73186604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21492496 + 19175641 = 4636^2 + 4379^2 .

It is a cyclic number.

It is not a de Polignac number, because 40668137 - 2¹⁴ = 40651753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40668097 and 40668106.

It is not an unprimeable number, because it can be changed into a prime (40668167) 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, 35168 + ... + 36305.

It is an arithmetic number, because the mean of its divisors is an integer number (10185045).

Almost surely, 2^40668137 is an apocalyptic number.

It is an amenable number.

40668137 is a deficient number, since it is larger than the sum of its proper divisors (72043).

40668137 is an equidigital number, since it uses as much as digits as its factorization.

40668137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72042.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 40668137 is about 6377.1574388594. The cubic root of 40668137 is about 343.8888482832. Note that the first 4 decimals are identical.

The spelling of 40668137 in words is "forty million, six hundred sixty-eight thousand, one hundred thirty-seven".