438020831 has 4 divisors (see below), whose sum is σ = 441172200. Its totient is φ = 434869464.

The previous prime is 438020801. The next prime is 438020867. The reversal of 438020831 is 138020834.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-438020831 is a prime.

It is a super-2 number, since 2×438020831² = 383724496779861122, 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 = 438020794 and 438020803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438020801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1575476 + ... + 1575753.

It is an arithmetic number, because the mean of its divisors is an integer number (110293050).

Almost surely, 2^438020831 is an apocalyptic number.

438020831 is a deficient number, since it is larger than the sum of its proper divisors (3151369).

438020831 is a wasteful number, since it uses less digits than its factorization.

438020831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151368.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 438020831 is about 20928.9472023798. The cubic root of 438020831 is about 759.4483710621.

The spelling of 438020831 in words is "four hundred thirty-eight million, twenty thousand, eight hundred thirty-one".