646965242 has 16 divisors (see below), whose sum is σ = 1209909312. Its totient is φ = 252064320.

The previous prime is 646965217. The next prime is 646965247. The reversal of 646965242 is 242569646.

It is a super-2 number, since 2×646965242² = 837128048712237128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646965193 and 646965202.

It is not an unprimeable number, because it can be changed into a prime (646965247) 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, 2100383 + ... + 2100690.

It is an arithmetic number, because the mean of its divisors is an integer number (75619332).

Almost surely, 2^646965242 is an apocalyptic number.

646965242 is a deficient number, since it is larger than the sum of its proper divisors (562944070).

646965242 is a wasteful number, since it uses less digits than its factorization.

646965242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4201093.

The product of its digits is 622080, while the sum is 44.

The square root of 646965242 is about 25435.5114357860. The cubic root of 646965242 is about 864.8888859022. Note that the first 5 decimals are identical.

The spelling of 646965242 in words is "six hundred forty-six million, nine hundred sixty-five thousand, two hundred forty-two".