415981 has 4 divisors (see below), whose sum is σ = 417312. Its totient is φ = 414652.

The previous prime is 415979. The next prime is 415993. The reversal of 415981 is 189514.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 415981 - 2¹ = 415979 is a prime.

It is a super-2 number, since 2×415981² = 346080384722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (415901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90 + ... + 916.

It is an arithmetic number, because the mean of its divisors is an integer number (104328).

2⁴¹⁵⁹⁸¹ is an apocalyptic number.

It is an amenable number.

415981 is a deficient number, since it is larger than the sum of its proper divisors (1331).

415981 is an equidigital number, since it uses as much as digits as its factorization.

415981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330.

The product of its digits is 1440, while the sum is 28.

The square root of 415981 is about 644.9658905710. The cubic root of 415981 is about 74.6490866172.

The spelling of 415981 in words is "four hundred fifteen thousand, nine hundred eighty-one".