406931 has 8 divisors (see below), whose sum is σ = 473184. Its totient is φ = 342720.

The previous prime is 406907. The next prime is 406951. The reversal of 406931 is 139604.

Added to its reverse (139604) it gives a triangular number (546535 = T₁₀₄₅).

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

It is a de Polignac number, because none of the positive numbers 2^k-406931 is a prime.

It is a super-2 number, since 2×406931² = 331185677522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 406897 and 406906.

It is not an unprimeable number, because it can be changed into a prime (406951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50 + ... + 903.

It is an arithmetic number, because the mean of its divisors is an integer number (59148).

2⁴⁰⁶⁹³¹ is an apocalyptic number.

406931 is a deficient number, since it is larger than the sum of its proper divisors (66253).

406931 is an equidigital number, since it uses as much as digits as its factorization.

406931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 406931 is about 637.9114358592. The cubic root of 406931 is about 74.1037623989.

Adding to 406931 its reverse (139604), we get a triangular number (546535 = T₁₀₄₅).

The spelling of 406931 in words is "four hundred six thousand, nine hundred thirty-one".