2405631 has 8 divisors (see below), whose sum is σ = 3311104. Its totient is φ = 1551960.

The previous prime is 2405621. The next prime is 2405633. The reversal of 2405631 is 1365042.

It is a happy number.

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

It is not a de Polignac number, because 2405631 - 2¹⁸ = 2143487 is a prime.

It is a super-2 number, since 2×2405631² = 11574121016322, 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 = 2405598 and 2405607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2405633) 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, 12841 + ... + 13026.

It is an arithmetic number, because the mean of its divisors is an integer number (413888).

2^2405631 is an apocalyptic number.

2405631 is a deficient number, since it is larger than the sum of its proper divisors (905473).

2405631 is a wasteful number, since it uses less digits than its factorization.

2405631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25901.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2405631 is about 1551.0096711497. The cubic root of 2405631 is about 133.9912187013.

The spelling of 2405631 in words is "two million, four hundred five thousand, six hundred thirty-one".