39491947 has 8 divisors (see below), whose sum is σ = 43263792. Its totient is φ = 35750400.

The previous prime is 39491929. The next prime is 39491953. The reversal of 39491947 is 74919493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39491947 - 2¹¹ = 39489899 is a prime.

It is a super-2 number, since 2×39491947² = 3119227755701618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 39491897 and 39491906.

It is not an unprimeable number, because it can be changed into a prime (39491917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4798 + ... + 10099.

It is an arithmetic number, because the mean of its divisors is an integer number (5407974).

Almost surely, 2^39491947 is an apocalyptic number.

39491947 is a deficient number, since it is larger than the sum of its proper divisors (3771845).

39491947 is a wasteful number, since it uses less digits than its factorization.

39491947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15149.

The product of its digits is 244944, while the sum is 46.

The square root of 39491947 is about 6284.2618500505. The cubic root of 39491947 is about 340.5410848136.

The spelling of 39491947 in words is "thirty-nine million, four hundred ninety-one thousand, nine hundred forty-seven".