401809206 has 16 divisors (see below), whose sum is σ = 806481648. Its totient is φ = 133459200.

The previous prime is 401809193. The next prime is 401809231. The reversal of 401809206 is 602908104.

It is a super-2 number, since 2×401809206² = 322901276052700872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117475 + ... + 120846.

It is an arithmetic number, because the mean of its divisors is an integer number (50405103).

Almost surely, 2^401809206 is an apocalyptic number.

401809206 is an abundant number, since it is smaller than the sum of its proper divisors (404672442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401809206 is a wasteful number, since it uses less digits than its factorization.

401809206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238607.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 401809206 is about 20045.1791211752. The cubic root of 401809206 is about 737.9154910907.

The spelling of 401809206 in words is "four hundred one million, eight hundred nine thousand, two hundred six".