210138944 has 14 divisors (see below), whose sum is σ = 416994594. Its totient is φ = 105069440.

The previous prime is 210138937. The next prime is 210138977. The reversal of 210138944 is 449831012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 191545600 + 18593344 = 13840^2 + 4312^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 210138944.

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, 1641647 + ... + 1641774.

Almost surely, 2^210138944 is an apocalyptic number.

It is an amenable number.

210138944 is a deficient number, since it is larger than the sum of its proper divisors (206855650).

210138944 is an equidigital number, since it uses as much as digits as its factorization.

210138944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3283433 (or 3283423 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 210138944 is about 14496.1699769284. The cubic root of 210138944 is about 594.5232572153.

Adding to 210138944 its reverse (449831012), we get a palindrome (659969956).

The spelling of 210138944 in words is "two hundred ten million, one hundred thirty-eight thousand, nine hundred forty-four".