213990637 has 8 divisors (see below), whose sum is σ = 246935936. Its totient is φ = 181639152.

The previous prime is 213990629. The next prime is 213990649. The reversal of 213990637 is 736099312.

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 213990637 - 2³ = 213990629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213990637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213990617) 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, 147678 + ... + 149119.

It is an arithmetic number, because the mean of its divisors is an integer number (30866992).

Almost surely, 2^213990637 is an apocalyptic number.

It is an amenable number.

213990637 is a deficient number, since it is larger than the sum of its proper divisors (32945299).

213990637 is a wasteful number, since it uses less digits than its factorization.

213990637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296907.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 213990637 is about 14628.4188140756. The cubic root of 213990637 is about 598.1336794690.

The spelling of 213990637 in words is "two hundred thirteen million, nine hundred ninety thousand, six hundred thirty-seven".