214391997 has 6 divisors (see below), whose sum is σ = 309677342. Its totient is φ = 142927992.

The previous prime is 214391987. The next prime is 214392037. The reversal of 214391997 is 799193412.

214391997 is a `hidden beast` number, since 21 + 439 + 199 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 207532836 + 6859161 = 14406^2 + 2619^2 .

It is not a de Polignac number, because 214391997 - 2⁷ = 214391869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214391987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11910658 + ... + 11910675.

Almost surely, 2^214391997 is an apocalyptic number.

It is an amenable number.

214391997 is a deficient number, since it is larger than the sum of its proper divisors (95285345).

214391997 is a wasteful number, since it uses less digits than its factorization.

214391997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23821339 (or 23821336 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 214391997 is about 14642.1308900037. The cubic root of 214391997 is about 598.5073983127.

It can be divided in two parts, 21439 and 1997, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 214391997 in words is "two hundred fourteen million, three hundred ninety-one thousand, nine hundred ninety-seven".