646944942 has 48 divisors (see below), whose sum is σ = 1537194240. Its totient is φ = 180904752.

The previous prime is 646944937. The next prime is 646944967. The reversal of 646944942 is 249449646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 646944891 and 646944900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9592 + ... + 37227.

It is an arithmetic number, because the mean of its divisors is an integer number (32024880).

Almost surely, 2^646944942 is an apocalyptic number.

646944942 is an abundant number, since it is smaller than the sum of its proper divisors (890249298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646944942 is a wasteful number, since it uses less digits than its factorization.

646944942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46885 (or 46878 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 48.

The square root of 646944942 is about 25435.1123842612. The cubic root of 646944942 is about 864.8798398583.

The spelling of 646944942 in words is "six hundred forty-six million, nine hundred forty-four thousand, nine hundred forty-two".