438631 has 2 divisors, whose sum is σ = 438632. Its totient is φ = 438630.

The previous prime is 438623. The next prime is 438637. The reversal of 438631 is 136834.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 438631 - 2³ = 438623 is a prime.

It is a super-2 number, since 2×438631² = 384794308322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 438596 and 438605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438637) 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 as a sum of consecutive naturals, namely, 219315 + 219316.

It is an arithmetic number, because the mean of its divisors is an integer number (219316).

2⁴³⁸⁶³¹ is an apocalyptic number.

438631 is a deficient number, since it is larger than the sum of its proper divisors (1).

438631 is an equidigital number, since it uses as much as digits as its factorization.

438631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 438631 is about 662.2922315715. The cubic root of 438631 is about 75.9800848095.

The spelling of 438631 in words is "four hundred thirty-eight thousand, six hundred thirty-one".