39649966 has 4 divisors (see below), whose sum is σ = 59474952. Its totient is φ = 19824982.

The previous prime is 39649963. The next prime is 39649969. The reversal of 39649966 is 66994693.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (39649963) and next prime (39649969).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39649963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9912490 + ... + 9912493.

It is an arithmetic number, because the mean of its divisors is an integer number (14868738).

Almost surely, 2^39649966 is an apocalyptic number.

39649966 is a deficient number, since it is larger than the sum of its proper divisors (19824986).

39649966 is a wasteful number, since it uses less digits than its factorization.

39649966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19824985.

The product of its digits is 1889568, while the sum is 52.

The square root of 39649966 is about 6296.8218967984. The cubic root of 39649966 is about 340.9946823387.

The spelling of 39649966 in words is "thirty-nine million, six hundred forty-nine thousand, nine hundred sixty-six".