210400006 has 4 divisors (see below), whose sum is σ = 315600012. Its totient is φ = 105200002.

The previous prime is 210399979. The next prime is 210400013. The reversal of 210400006 is 600004012.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52600000 + ... + 52600003.

It is an arithmetic number, because the mean of its divisors is an integer number (78900003).

Almost surely, 2^210400006 is an apocalyptic number.

210400006 is a deficient number, since it is larger than the sum of its proper divisors (105200006).

210400006 is a wasteful number, since it uses less digits than its factorization.

210400006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105200005.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 210400006 is about 14505.1716983978. The cubic root of 210400006 is about 594.7693534394.

Adding to 210400006 its reverse (600004012), we get a palindrome (810404018).

The spelling of 210400006 in words is "two hundred ten million, four hundred thousand, six".