661894 has 8 divisors (see below), whose sum is σ = 1036080. Its totient is φ = 316536.

The previous prime is 661889. The next prime is 661897. The reversal of 661894 is 498166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661897) by changing a digit.

661894 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7149 + ... + 7240.

It is an arithmetic number, because the mean of its divisors is an integer number (129510).

2⁶⁶¹⁸⁹⁴ is an apocalyptic number.

661894 is a deficient number, since it is larger than the sum of its proper divisors (374186).

661894 is a wasteful number, since it uses less digits than its factorization.

661894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14414.

The product of its digits is 10368, while the sum is 34.

The square root of 661894 is about 813.5686817964. The cubic root of 661894 is about 87.1490815994.

The spelling of 661894 in words is "six hundred sixty-one thousand, eight hundred ninety-four".