646083942 has 32 divisors (see below), whose sum is σ = 1554489600. Its totient is φ = 174879648.

The previous prime is 646083913. The next prime is 646083943. The reversal of 646083942 is 249380646.

It is a happy number.

It is a super-2 number, since 2×646083942² = 834848920220518728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 646083894 and 646083903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646083943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 404017 + ... + 405612.

It is an arithmetic number, because the mean of its divisors is an integer number (48577800).

Almost surely, 2^646083942 is an apocalyptic number.

646083942 is an abundant number, since it is smaller than the sum of its proper divisors (908405658).

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

646083942 is a wasteful number, since it uses less digits than its factorization.

646083942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809660.

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 646083942 is about 25418.1813275458. The cubic root of 646083942 is about 864.4959884733.

The spelling of 646083942 in words is "six hundred forty-six million, eighty-three thousand, nine hundred forty-two".