40661447 has 4 divisors (see below), whose sum is σ = 42429360. Its totient is φ = 38893536.

The previous prime is 40661407. The next prime is 40661449. The reversal of 40661447 is 74416604.

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 40661447 - 2²⁰ = 39612871 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 (40661449) 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, 883922 + ... + 883967.

It is an arithmetic number, because the mean of its divisors is an integer number (10607340).

Almost surely, 2^40661447 is an apocalyptic number.

40661447 is a deficient number, since it is larger than the sum of its proper divisors (1767913).

40661447 is a wasteful number, since it uses less digits than its factorization.

40661447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767912.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 40661447 is about 6376.6328889156. The cubic root of 40661447 is about 343.8699904194.

The spelling of 40661447 in words is "forty million, six hundred sixty-one thousand, four hundred forty-seven".