406538197 has 4 divisors (see below), whose sum is σ = 437810380. Its totient is φ = 375266016.

The previous prime is 406538189. The next prime is 406538227. The reversal of 406538197 is 791835604.

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 265070961 + 141467236 = 16281^2 + 11894^2 .

It is a cyclic number.

It is not a de Polignac number, because 406538197 - 2³ = 406538189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406538107) 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, 15636072 + ... + 15636097.

It is an arithmetic number, because the mean of its divisors is an integer number (109452595).

Almost surely, 2^406538197 is an apocalyptic number.

It is an amenable number.

406538197 is a deficient number, since it is larger than the sum of its proper divisors (31272183).

406538197 is a wasteful number, since it uses less digits than its factorization.

406538197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31272182.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 406538197 is about 20162.7923909363. The cubic root of 406538197 is about 740.7991105717.

The spelling of 406538197 in words is "four hundred six million, five hundred thirty-eight thousand, one hundred ninety-seven".