39800197 has 4 divisors (see below), whose sum is σ = 40875916. Its totient is φ = 38724480.

The previous prime is 39800183. The next prime is 39800221. The reversal of 39800197 is 79100893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33802596 + 5997601 = 5814^2 + 2449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39800197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1075681 = 39800197 / (3 + 9 + 8 + 0 + 0 + 1 + 9 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39800797) 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, 537804 + ... + 537877.

It is an arithmetic number, because the mean of its divisors is an integer number (10218979).

Almost surely, 2^39800197 is an apocalyptic number.

39800197 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

39800197 is a deficient number, since it is larger than the sum of its proper divisors (1075719).

39800197 is a wasteful number, since it uses less digits than its factorization.

39800197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075718.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 39800197 is about 6308.7397315153. The cubic root of 39800197 is about 341.4248080393.

The spelling of 39800197 in words is "thirty-nine million, eight hundred thousand, one hundred ninety-seven".