438304387 has 4 divisors (see below), whose sum is σ = 464087016. Its totient is φ = 412521760.

The previous prime is 438304379. The next prime is 438304393. The reversal of 438304387 is 783403834.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 438304387 - 2³ = 438304379 is a prime.

It is a super-2 number, since 2×438304387² = 384221471326891538, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438304357) 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, 12891289 + ... + 12891322.

It is an arithmetic number, because the mean of its divisors is an integer number (116021754).

Almost surely, 2^438304387 is an apocalyptic number.

438304387 is a deficient number, since it is larger than the sum of its proper divisors (25782629).

438304387 is a wasteful number, since it uses less digits than its factorization.

438304387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25782628.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 438304387 is about 20935.7203601882. The cubic root of 438304387 is about 759.6122138714.

The spelling of 438304387 in words is "four hundred thirty-eight million, three hundred four thousand, three hundred eighty-seven".