646925539 has 8 divisors (see below), whose sum is σ = 698634720. Its totient is φ = 595494336.

The previous prime is 646925537. The next prime is 646925563. The reversal of 646925539 is 935529646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 646925539 - 2¹ = 646925537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646925492 and 646925501.

It is not an unprimeable number, because it can be changed into a prime (646925537) 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, 64642 + ... + 73975.

It is an arithmetic number, because the mean of its divisors is an integer number (87329340).

Almost surely, 2^646925539 is an apocalyptic number.

646925539 is a deficient number, since it is larger than the sum of its proper divisors (51709181).

646925539 is a wasteful number, since it uses less digits than its factorization.

646925539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138989.

The product of its digits is 1749600, while the sum is 49.

The square root of 646925539 is about 25434.7309598509. The cubic root of 646925539 is about 864.8711933568.

The spelling of 646925539 in words is "six hundred forty-six million, nine hundred twenty-five thousand, five hundred thirty-nine".