212640454 has 16 divisors (see below), whose sum is σ = 363702528. Its totient is φ = 92368512.

The previous prime is 212640427. The next prime is 212640481. The reversal of 212640454 is 454046212.

It is an interprime number because it is at equal distance from previous prime (212640427) and next prime (212640481).

It is a super-2 number, since 2×212640454² = 90431925354652232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240102 + ... + 240985.

It is an arithmetic number, because the mean of its divisors is an integer number (22731408).

Almost surely, 2^212640454 is an apocalyptic number.

212640454 is a deficient number, since it is larger than the sum of its proper divisors (151062074).

212640454 is a wasteful number, since it uses less digits than its factorization.

212640454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481119.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 212640454 is about 14582.1964737827. The cubic root of 212640454 is about 596.8730411163.

Adding to 212640454 its reverse (454046212), we get a palindrome (666686666).

The spelling of 212640454 in words is "two hundred twelve million, six hundred forty thousand, four hundred fifty-four".