438640838 has 8 divisors (see below), whose sum is σ = 658064088. Its totient is φ = 219286144.

The previous prime is 438640819. The next prime is 438640877. The reversal of 438640838 is 838046834.

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

It is a super-2 number, since 2×438640838² = 384811569522684488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4145 + ... + 29907.

It is an arithmetic number, because the mean of its divisors is an integer number (82258011).

Almost surely, 2^438640838 is an apocalyptic number.

438640838 is a deficient number, since it is larger than the sum of its proper divisors (219423250).

438640838 is a wasteful number, since it uses less digits than its factorization.

438640838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34278.

The product of its (nonzero) digits is 442368, while the sum is 44.

The square root of 438640838 is about 20943.7541524914. The cubic root of 438640838 is about 759.8065285458.

The spelling of 438640838 in words is "four hundred thirty-eight million, six hundred forty thousand, eight hundred thirty-eight".