39840946 has 4 divisors (see below), whose sum is σ = 59761422. Its totient is φ = 19920472.

The previous prime is 39840937. The next prime is 39840953. The reversal of 39840946 is 64904893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64904893 = 19 ⋅3416047.

It can be written as a sum of positive squares in only one way, i.e., 28355625 + 11485321 = 5325^2 + 3389^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9960235 + ... + 9960238.

Almost surely, 2^39840946 is an apocalyptic number.

39840946 is a deficient number, since it is larger than the sum of its proper divisors (19920476).

39840946 is a wasteful number, since it uses less digits than its factorization.

39840946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19920475.

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

The square root of 39840946 is about 6311.9684726716. The cubic root of 39840946 is about 341.5412896576.

The spelling of 39840946 in words is "thirty-nine million, eight hundred forty thousand, nine hundred forty-six".