260831421 has 20 divisors (see below), whose sum is σ = 398703712. Its totient is φ = 169841448.

The previous prime is 260831413. The next prime is 260831429. The reversal of 260831421 is 124138062.

260831421 is a `hidden beast` number, since 2 + 608 + 31 + 4 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (260831413) and next prime (260831429).

It is not a de Polignac number, because 260831421 - 2³ = 260831413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260831429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 33961 + ... + 40926.

Almost surely, 2^260831421 is an apocalyptic number.

It is an amenable number.

260831421 is a deficient number, since it is larger than the sum of its proper divisors (137872291).

260831421 is an equidigital number, since it uses as much as digits as its factorization.

260831421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74942 (or 74933 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 260831421 is about 16150.2761895888. The cubic root of 260831421 is about 638.9300326751.

Adding to 260831421 its reverse (124138062), we get a palindrome (384969483).

The spelling of 260831421 in words is "two hundred sixty million, eight hundred thirty-one thousand, four hundred twenty-one".