39779947 has 2 divisors, whose sum is σ = 39779948. Its totient is φ = 39779946.

The previous prime is 39779941. The next prime is 39779959. The reversal of 39779947 is 74997793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39779947 - 2¹⁹ = 39255659 is a prime.

It is a super-3 number, since 3×39779947³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (39779941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19889973 + 19889974.

It is an arithmetic number, because the mean of its divisors is an integer number (19889974).

Almost surely, 2^39779947 is an apocalyptic number.

39779947 is a deficient number, since it is larger than the sum of its proper divisors (1).

39779947 is an equidigital number, since it uses as much as digits as its factorization.

39779947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000564, while the sum is 55.

The square root of 39779947 is about 6307.1346108990. The cubic root of 39779947 is about 341.3668935415.

It can be divided in two parts, 3977 and 9947, that added together give a square (13924 = 118²).

The spelling of 39779947 in words is "thirty-nine million, seven hundred seventy-nine thousand, nine hundred forty-seven".