39897897 has 16 divisors (see below), whose sum is σ = 58148160. Its totient is φ = 24184512.

The previous prime is 39897883. The next prime is 39897911. The reversal of 39897897 is 79879893.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (39897883) and next prime (39897911).

It is not a de Polignac number, because 39897897 - 2¹⁰ = 39896873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39897897.

It is not an unprimeable number, because it can be changed into a prime (39897857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5022 + ... + 10247.

It is an arithmetic number, because the mean of its divisors is an integer number (3634260).

Almost surely, 2^39897897 is an apocalyptic number.

It is an amenable number.

39897897 is a deficient number, since it is larger than the sum of its proper divisors (18250263).

39897897 is a wasteful number, since it uses less digits than its factorization.

39897897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15352.

The product of its digits is 6858432, while the sum is 60.

The square root of 39897897 is about 6316.4782117886. The cubic root of 39897897 is about 341.7039519360.

The spelling of 39897897 in words is "thirty-nine million, eight hundred ninety-seven thousand, eight hundred ninety-seven".