213955689 has 8 divisors (see below), whose sum is σ = 286097760. Its totient is φ = 142225376.

The previous prime is 213955681. The next prime is 213955691. The reversal of 213955689 is 986559312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213955689 - 2³ = 213955681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213955681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101724 + ... + 103805.

It is an arithmetic number, because the mean of its divisors is an integer number (35762220).

Almost surely, 2^213955689 is an apocalyptic number.

It is an amenable number.

213955689 is a deficient number, since it is larger than the sum of its proper divisors (72142071).

213955689 is a wasteful number, since it uses less digits than its factorization.

213955689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205879.

The product of its digits is 583200, while the sum is 48.

The square root of 213955689 is about 14627.2242411197. The cubic root of 213955689 is about 598.1011161846.

The spelling of 213955689 in words is "two hundred thirteen million, nine hundred fifty-five thousand, six hundred eighty-nine".