39403661 has 8 divisors (see below), whose sum is σ = 43042944. Its totient is φ = 35773920.

The previous prime is 39403643. The next prime is 39403667. The reversal of 39403661 is 16630493.

It is a happy number.

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 39403661 - 2¹⁸ = 39141517 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 (39403667) 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, 8396 + ... + 12218.

It is an arithmetic number, because the mean of its divisors is an integer number (5380368).

Almost surely, 2^39403661 is an apocalyptic number.

It is an amenable number.

39403661 is a deficient number, since it is larger than the sum of its proper divisors (3639283).

39403661 is a wasteful number, since it uses less digits than its factorization.

39403661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4771.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 39403661 is about 6277.2335467147. The cubic root of 39403661 is about 340.2871305752.

The spelling of 39403661 in words is "thirty-nine million, four hundred three thousand, six hundred sixty-one".