39800947 has 2 divisors, whose sum is σ = 39800948. Its totient is φ = 39800946.

The previous prime is 39800939. The next prime is 39800983. The reversal of 39800947 is 74900893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39800947 - 2³ = 39800939 is a prime.

It is not a weakly prime, because it can be changed into another prime (39800647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19900473 + 19900474.

It is an arithmetic number, because the mean of its divisors is an integer number (19900474).

Almost surely, 2^39800947 is an apocalyptic number.

39800947 is a deficient number, since it is larger than the sum of its proper divisors (1).

39800947 is an equidigital number, since it uses as much as digits as its factorization.

39800947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 39800947 is about 6308.7991725843. The cubic root of 39800947 is about 341.4269526434.

The spelling of 39800947 in words is "thirty-nine million, eight hundred thousand, nine hundred forty-seven".