40031661 has 8 divisors (see below), whose sum is σ = 55696320. Its totient is φ = 25527392.

The previous prime is 40031657. The next prime is 40031713. The reversal of 40031661 is 16613004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40031661 - 2² = 40031657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40031611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290016 + ... + 290153.

It is an arithmetic number, because the mean of its divisors is an integer number (6962040).

Almost surely, 2^40031661 is an apocalyptic number.

It is an amenable number.

40031661 is a deficient number, since it is larger than the sum of its proper divisors (15664659).

40031661 is a wasteful number, since it uses less digits than its factorization.

40031661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580195.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 40031661 is about 6327.0578470566. The cubic root of 40031661 is about 342.0853981194.

Adding to 40031661 its reverse (16613004), we get a palindrome (56644665).

The spelling of 40031661 in words is "forty million, thirty-one thousand, six hundred sixty-one".