281393138 has 32 divisors (see below), whose sum is σ = 473088000. Its totient is φ = 124649280.

The previous prime is 281393137. The next prime is 281393153. The reversal of 281393138 is 831393182.

It is a super-2 number, since 2×281393138² = 158364196226974088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (281393131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100988 + ... + 103736.

It is an arithmetic number, because the mean of its divisors is an integer number (14784000).

Almost surely, 2^281393138 is an apocalyptic number.

281393138 is a deficient number, since it is larger than the sum of its proper divisors (191694862).

281393138 is a wasteful number, since it uses less digits than its factorization.

281393138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922.

The product of its digits is 31104, while the sum is 38.

The square root of 281393138 is about 16774.7768390521. The cubic root of 281393138 is about 655.2964786444.

The spelling of 281393138 in words is "two hundred eighty-one million, three hundred ninety-three thousand, one hundred thirty-eight".