39864661 has 4 divisors (see below), whose sum is σ = 39923712. Its totient is φ = 39805612.

The previous prime is 39864653. The next prime is 39864673. The reversal of 39864661 is 16646893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16646893 = 17 ⋅979229.

It is a cyclic number.

It is not a de Polignac number, because 39864661 - 2³ = 39864653 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 (39864691) 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, 28501 + ... + 29866.

It is an arithmetic number, because the mean of its divisors is an integer number (9980928).

Almost surely, 2^39864661 is an apocalyptic number.

It is an amenable number.

39864661 is a deficient number, since it is larger than the sum of its proper divisors (59051).

39864661 is an equidigital number, since it uses as much as digits as its factorization.

39864661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59050.

The product of its digits is 186624, while the sum is 43.

The square root of 39864661 is about 6313.8467672252. The cubic root of 39864661 is about 341.6090427772.

The spelling of 39864661 in words is "thirty-nine million, eight hundred sixty-four thousand, six hundred sixty-one".