213751730 has 8 divisors (see below), whose sum is σ = 384753132. Its totient is φ = 85500688.

The previous prime is 213751711. The next prime is 213751751. The reversal of 213751730 is 37157312.

It can be written as a sum of positive squares in 2 ways, for example, as 211149961 + 2601769 = 14531^2 + 1613^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 213751693 and 213751702.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10687577 + ... + 10687596.

Almost surely, 2^213751730 is an apocalyptic number.

213751730 is a deficient number, since it is larger than the sum of its proper divisors (171001402).

213751730 is a wasteful number, since it uses less digits than its factorization.

213751730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21375180.

The product of its (nonzero) digits is 4410, while the sum is 29.

The square root of 213751730 is about 14620.2506818454. The cubic root of 213751730 is about 597.9110037841.

The spelling of 213751730 in words is "two hundred thirteen million, seven hundred fifty-one thousand, seven hundred thirty".