409631 has 8 divisors (see below), whose sum is σ = 428064. Its totient is φ = 391680.

The previous prime is 409609. The next prime is 409639. The reversal of 409631 is 136904.

Added to its reverse (136904) it gives a triangular number (546535 = T₁₀₄₅).

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 409631 - 2¹⁰ = 408607 is a prime.

It is a super-2 number, since 2×409631² = 335595112322, 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 = 409597 and 409606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409639) 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, 3926 + ... + 4028.

It is an arithmetic number, because the mean of its divisors is an integer number (53508).

2⁴⁰⁹⁶³¹ is an apocalyptic number.

409631 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

409631 is a deficient number, since it is larger than the sum of its proper divisors (18433).

409631 is a wasteful number, since it uses less digits than its factorization.

409631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241.

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

The square root of 409631 is about 640.0242182918. The cubic root of 409631 is about 74.2672948485.

Adding to 409631 its reverse (136904), we get a triangular number (546535 = T₁₀₄₅).

The spelling of 409631 in words is "four hundred nine thousand, six hundred thirty-one".