281993930 has 8 divisors (see below), whose sum is σ = 507589092. Its totient is φ = 112797568.

The previous prime is 281993923. The next prime is 281993947. The reversal of 281993930 is 39399182.

It can be written as a sum of positive squares in 2 ways, for example, as 256096009 + 25897921 = 16003^2 + 5089^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14099687 + ... + 14099706.

Almost surely, 2^281993930 is an apocalyptic number.

281993930 is a deficient number, since it is larger than the sum of its proper divisors (225595162).

281993930 is a wasteful number, since it uses less digits than its factorization.

281993930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28199400.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 281993930 is about 16792.6748911542. The cubic root of 281993930 is about 655.7625134922.

The spelling of 281993930 in words is "two hundred eighty-one million, nine hundred ninety-three thousand, nine hundred thirty".