438904981 has 8 divisors (see below), whose sum is σ = 445439744. Its totient is φ = 432384480.

The previous prime is 438904969. The next prime is 438904987. The reversal of 438904981 is 189409834.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-438904981 is a prime.

It is a super-2 number, since 2×438904981² = 385275164693220722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438904987) 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, 69310 + ... + 75376.

It is an arithmetic number, because the mean of its divisors is an integer number (55679968).

Almost surely, 2^438904981 is an apocalyptic number.

It is an amenable number.

438904981 is a deficient number, since it is larger than the sum of its proper divisors (6534763).

438904981 is an equidigital number, since it uses as much as digits as its factorization.

438904981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7131.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 438904981 is about 20950.0592123268. The cubic root of 438904981 is about 759.9590126788.

The spelling of 438904981 in words is "four hundred thirty-eight million, nine hundred four thousand, nine hundred eighty-one".