39947963 has 4 divisors (see below), whose sum is σ = 43579608. Its totient is φ = 36316320.

The previous prime is 39947953. The next prime is 39947969. The reversal of 39947963 is 36974993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36974993 = 11 ⋅3361363.

It is a cyclic number.

It is not a de Polignac number, because 39947963 - 2²² = 35753659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39947969) 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, 1815806 + ... + 1815827.

It is an arithmetic number, because the mean of its divisors is an integer number (10894902).

Almost surely, 2^39947963 is an apocalyptic number.

39947963 is a deficient number, since it is larger than the sum of its proper divisors (3631645).

39947963 is a wasteful number, since it uses less digits than its factorization.

39947963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3631644.

The product of its digits is 1102248, while the sum is 50.

The square root of 39947963 is about 6320.4400954364. The cubic root of 39947963 is about 341.8468216144.

The spelling of 39947963 in words is "thirty-nine million, nine hundred forty-seven thousand, nine hundred sixty-three".