646953398 has 16 divisors (see below), whose sum is σ = 1194375840. Its totient is φ = 255937536.

The previous prime is 646953397. The next prime is 646953409. The reversal of 646953398 is 893359646.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646953397) 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, 1777163 + ... + 1777526.

It is an arithmetic number, because the mean of its divisors is an integer number (74648490).

Almost surely, 2^646953398 is an apocalyptic number.

646953398 is a deficient number, since it is larger than the sum of its proper divisors (547422442).

646953398 is a wasteful number, since it uses less digits than its factorization.

646953398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3554711.

The product of its digits is 4199040, while the sum is 53.

The square root of 646953398 is about 25435.2786106227. The cubic root of 646953398 is about 864.8836080265.

The spelling of 646953398 in words is "six hundred forty-six million, nine hundred fifty-three thousand, three hundred ninety-eight".