667942 has 16 divisors (see below), whose sum is σ = 1107792. Its totient is φ = 299520.

The previous prime is 667921. The next prime is 667949. The reversal of 667942 is 249766.

It is a super-2 number, since 2×667942² = 892293030728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 667898 and 667907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667949) 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, 1978 + ... + 2290.

It is an arithmetic number, because the mean of its divisors is an integer number (69237).

2⁶⁶⁷⁹⁴² is an apocalyptic number.

667942 is a deficient number, since it is larger than the sum of its proper divisors (439850).

667942 is a wasteful number, since it uses less digits than its factorization.

667942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423.

The product of its digits is 18144, while the sum is 34.

The square root of 667942 is about 817.2771867610. The cubic root of 667942 is about 87.4137163042.

It can be divided in two parts, 66 and 7942, that added together give a palindrome (8008).

The spelling of 667942 in words is "six hundred sixty-seven thousand, nine hundred forty-two".