211406890 has 8 divisors (see below), whose sum is σ = 380532420. Its totient is φ = 84562752.

The previous prime is 211406873. The next prime is 211406891. The reversal of 211406890 is 98604112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 189420169 + 21986721 = 13763^2 + 4689^2 .

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

It is not an unprimeable number, because it can be changed into a prime (211406891) 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, 10570335 + ... + 10570354.

Almost surely, 2^211406890 is an apocalyptic number.

211406890 is a deficient number, since it is larger than the sum of its proper divisors (169125530).

211406890 is a wasteful number, since it uses less digits than its factorization.

211406890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21140696.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 211406890 is about 14539.8380321103. The cubic root of 211406890 is about 595.7166141473.

The spelling of 211406890 in words is "two hundred eleven million, four hundred six thousand, eight hundred ninety".