281820934 has 32 divisors (see below), whose sum is σ = 467609760. Its totient is φ = 126816768.

The previous prime is 281820923. The next prime is 281820937. The reversal of 281820934 is 439028182.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 281820893 and 281820902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281820937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72324 + ... + 76120.

It is an arithmetic number, because the mean of its divisors is an integer number (14612805).

Almost surely, 2^281820934 is an apocalyptic number.

281820934 is a deficient number, since it is larger than the sum of its proper divisors (185788826).

281820934 is a wasteful number, since it uses less digits than its factorization.

281820934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 281820934 is about 16787.5231645410. The cubic root of 281820934 is about 655.6283882670.

The spelling of 281820934 in words is "two hundred eighty-one million, eight hundred twenty thousand, nine hundred thirty-four".