210140442 has 48 divisors (see below), whose sum is σ = 467026560. Its totient is φ = 68261856.

The previous prime is 210140401. The next prime is 210140449. The reversal of 210140442 is 244041012.

210140442 is a `hidden beast` number, since 210 + 14 + 0 + 442 = 666.

210140442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (210140449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158659 + ... + 159977.

It is an arithmetic number, because the mean of its divisors is an integer number (9729720).

Almost surely, 2^210140442 is an apocalyptic number.

210140442 is an abundant number, since it is smaller than the sum of its proper divisors (256886118).

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

210140442 is a wasteful number, since it uses less digits than its factorization.

210140442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547 (or 1544 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 210140442 is about 14496.2216456565. The cubic root of 210140442 is about 594.5246699215.

Adding to 210140442 its reverse (244041012), we get a palindrome (454181454).

The spelling of 210140442 in words is "two hundred ten million, one hundred forty thousand, four hundred forty-two".