646399094 has 8 divisors (see below), whose sum is σ = 1057744008. Its totient is φ = 293817760.

The previous prime is 646399087. The next prime is 646399097. The reversal of 646399094 is 490993646.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646399097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14690867 + ... + 14690910.

It is an arithmetic number, because the mean of its divisors is an integer number (132218001).

Almost surely, 2^646399094 is an apocalyptic number.

646399094 is a deficient number, since it is larger than the sum of its proper divisors (411344914).

646399094 is a wasteful number, since it uses less digits than its factorization.

646399094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29381790.

The product of its (nonzero) digits is 1259712, while the sum is 50.

The square root of 646399094 is about 25424.3799137757. The cubic root of 646399094 is about 864.6365292169.

The spelling of 646399094 in words is "six hundred forty-six million, three hundred ninety-nine thousand, ninety-four".