214400645 has 4 divisors (see below), whose sum is σ = 257280780. Its totient is φ = 171520512.

The previous prime is 214400639. The next prime is 214400647. The reversal of 214400645 is 546004412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 87928129 + 126472516 = 9377^2 + 11246^2 .

It is a cyclic number.

It is not a de Polignac number, because 214400645 - 2⁶ = 214400581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214400647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21440060 + ... + 21440069.

It is an arithmetic number, because the mean of its divisors is an integer number (64320195).

Almost surely, 2^214400645 is an apocalyptic number.

It is an amenable number.

214400645 is a deficient number, since it is larger than the sum of its proper divisors (42880135).

214400645 is an equidigital number, since it uses as much as digits as its factorization.

214400645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42880134.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 214400645 is about 14642.4261992335. The cubic root of 214400645 is about 598.5154456006.

The spelling of 214400645 in words is "two hundred fourteen million, four hundred thousand, six hundred forty-five".