647442 has 12 divisors (see below), whose sum is σ = 1402830. Its totient is φ = 215808.

The previous prime is 647441. The next prime is 647453. The reversal of 647442 is 244746.

It can be written as a sum of positive squares in only one way, i.e., 408321 + 239121 = 639^2 + 489^2 .

It is a super-2 number, since 2×647442² = 838362286728, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647442.

It is not an unprimeable number, because it can be changed into a prime (647441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17967 + ... + 18002.

2⁶⁴⁷⁴⁴² is an apocalyptic number.

647442 is an abundant number, since it is smaller than the sum of its proper divisors (755388).

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

647442 is a wasteful number, since it uses less digits than its factorization.

647442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35977 (or 35974 counting only the distinct ones).

The product of its digits is 5376, while the sum is 27.

The square root of 647442 is about 804.6378067180. The cubic root of 647442 is about 86.5101283428.

It can be divided in two parts, 64744 and 2, that added together give a palindrome (64746).

The spelling of 647442 in words is "six hundred forty-seven thousand, four hundred forty-two".