400808194 has 8 divisors (see below), whose sum is σ = 602529228. Its totient is φ = 199965120.

The previous prime is 400808147. The next prime is 400808227. The reversal of 400808194 is 491808004.

It can be written as a sum of positive squares in 2 ways, for example, as 296012025 + 104796169 = 17205^2 + 10237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-5 number, since 5×400808194⁵ (a number of 44 digits) contains 55555 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218347 + ... + 220174.

Almost surely, 2^400808194 is an apocalyptic number.

400808194 is a deficient number, since it is larger than the sum of its proper divisors (201721034).

400808194 is a wasteful number, since it uses less digits than its factorization.

400808194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438980.

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

The square root of 400808194 is about 20020.1946543983. The cubic root of 400808194 is about 737.3022012495.

The spelling of 400808194 in words is "four hundred million, eight hundred eight thousand, one hundred ninety-four".