407981 has 8 divisors (see below), whose sum is σ = 470400. Its totient is φ = 346608.

The previous prime is 407977. The next prime is 407993. The reversal of 407981 is 189704.

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

It is a cyclic number.

It is not a de Polignac number, because 407981 - 2² = 407977 is a prime.

It is a super-2 number, since 2×407981² = 332896992722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (407971) 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 7 ways as a sum of consecutive naturals, for example, 995 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (58800).

2⁴⁰⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

407981 is a deficient number, since it is larger than the sum of its proper divisors (62419).

407981 is a wasteful number, since it uses less digits than its factorization.

407981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 407981 is about 638.7339039068. The cubic root of 407981 is about 74.1674440576.

The spelling of 407981 in words is "four hundred seven thousand, nine hundred eighty-one".