661942 has 12 divisors (see below), whose sum is σ = 1022220. Its totient is φ = 321468.

The previous prime is 661939. The next prime is 661949. The reversal of 661942 is 249166.

661942 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×661942² = 876334422728, which contains 22 as substring.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 661942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661949) 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, 3609 + ... + 3787.

It is an arithmetic number, because the mean of its divisors is an integer number (85185).

2⁶⁶¹⁹⁴² is an apocalyptic number.

661942 is a deficient number, since it is larger than the sum of its proper divisors (360278).

661942 is a wasteful number, since it uses less digits than its factorization.

661942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 224 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 661942 is about 813.5981809223. The cubic root of 661942 is about 87.1511882080.

The spelling of 661942 in words is "six hundred sixty-one thousand, nine hundred forty-two".