1861601 has 8 divisors (see below), whose sum is σ = 2239680. Its totient is φ = 1511568.

The previous prime is 1861591. The next prime is 1861621. The reversal of 1861601 is 1061681.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1861601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861621) 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, 6866 + ... + 7131.

It is an arithmetic number, because the mean of its divisors is an integer number (279960).

2^1861601 is an apocalyptic number.

It is an amenable number.

1861601 is a deficient number, since it is larger than the sum of its proper divisors (378079).

1861601 is a wasteful number, since it uses less digits than its factorization.

1861601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14023.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1861601 is about 1364.4049985250. The cubic root of 1861601 is about 123.0161699058.

The spelling of 1861601 in words is "one million, eight hundred sixty-one thousand, six hundred one".