408220189 has 4 divisors (see below), whose sum is σ = 439621756. Its totient is φ = 376818624.

The previous prime is 408220181. The next prime is 408220193. The reversal of 408220189 is 981022804.

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 87272964 + 320947225 = 9342^2 + 17915^2 .

It is not a de Polignac number, because 408220189 - 2³ = 408220181 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 (408220181) 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, 15700764 + ... + 15700789.

It is an arithmetic number, because the mean of its divisors is an integer number (109905439).

Almost surely, 2^408220189 is an apocalyptic number.

It is an amenable number.

408220189 is a deficient number, since it is larger than the sum of its proper divisors (31401567).

408220189 is a wasteful number, since it uses less digits than its factorization.

408220189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31401566.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 408220189 is about 20204.4596314774. The cubic root of 408220189 is about 741.8193539503.

The spelling of 408220189 in words is "four hundred eight million, two hundred twenty thousand, one hundred eighty-nine".