211942404 has 18 divisors (see below), whose sum is σ = 535743390. Its totient is φ = 70647456.

The previous prime is 211942403. The next prime is 211942439. The reversal of 211942404 is 404249112.

It is a happy number.

211942404 is a `hidden beast` number, since 211 + 9 + 42 + 404 = 666.

It can be written as a sum of positive squares in only one way, i.e., 183873600 + 28068804 = 13560^2 + 5298^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×211942404² = 89839165226598432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211942403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2943609 + ... + 2943680.

Almost surely, 2^211942404 is an apocalyptic number.

It is an amenable number.

211942404 is an abundant number, since it is smaller than the sum of its proper divisors (323800986).

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

211942404 is a wasteful number, since it uses less digits than its factorization.

211942404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5887299 (or 5887294 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 211942404 is about 14558.2417894470. The cubic root of 211942404 is about 596.2191925330.

The spelling of 211942404 in words is "two hundred eleven million, nine hundred forty-two thousand, four hundred four".