685003138 has 4 divisors (see below), whose sum is σ = 1027504710. Its totient is φ = 342501568.

The previous prime is 685003133. The next prime is 685003139. The reversal of 685003138 is 831300586.

It is a happy number.

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., 627652809 + 57350329 = 25053^2 + 7573^2 .

It is not an unprimeable number, because it can be changed into a prime (685003133) by changing a digit.

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 as a sum of consecutive naturals, namely, 171250783 + ... + 171250786.

Almost surely, 2^685003138 is an apocalyptic number.

685003138 is a deficient number, since it is larger than the sum of its proper divisors (342501572).

685003138 is a wasteful number, since it uses less digits than its factorization.

685003138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342501571.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 685003138 is about 26172.5646049446. The cubic root of 685003138 is about 881.5173280286.

The spelling of 685003138 in words is "six hundred eighty-five million, three thousand, one hundred thirty-eight".