210440505 has 32 divisors (see below), whose sum is σ = 368271360. Its totient is φ = 101766080.

The previous prime is 210440473. The next prime is 210440509. The reversal of 210440505 is 505044012.

It is not a de Polignac number, because 210440505 - 2⁵ = 210440473 is a prime.

It is a super-2 number, since 2×210440505² = 88570412289310050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (210440509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71656 + ... + 74534.

It is an arithmetic number, because the mean of its divisors is an integer number (11508480).

Almost surely, 2^210440505 is an apocalyptic number.

It is an amenable number.

210440505 is a deficient number, since it is larger than the sum of its proper divisors (157830855).

210440505 is a wasteful number, since it uses less digits than its factorization.

210440505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 210440505 is about 14506.5676505506. The cubic root of 210440505 is about 594.8075125300.

Adding to 210440505 its reverse (505044012), we get a palindrome (715484517).

The spelling of 210440505 in words is "two hundred ten million, four hundred forty thousand, five hundred five".