838640938 has 4 divisors (see below), whose sum is σ = 1257961410. Its totient is φ = 419320468.

The previous prime is 838640903. The next prime is 838640941. The reversal of 838640938 is 839046838.

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

It can be written as a sum of positive squares in only one way, i.e., 826965049 + 11675889 = 28757^2 + 3417^2 .

It is a junction number, because it is equal to n+sod(n) for n = 838640891 and 838640900.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209660233 + ... + 209660236.

Almost surely, 2^838640938 is an apocalyptic number.

838640938 is a deficient number, since it is larger than the sum of its proper divisors (419320472).

838640938 is a wasteful number, since it uses less digits than its factorization.

838640938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419320471.

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 838640938 is about 28959.2979541977. The cubic root of 838640938 is about 943.0296611752.

The spelling of 838640938 in words is "eight hundred thirty-eight million, six hundred forty thousand, nine hundred thirty-eight".