1849661 has 4 divisors (see below), whose sum is σ = 2017824. Its totient is φ = 1681500.

The previous prime is 1849643. The next prime is 1849663. The reversal of 1849661 is 1669481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1669481 = 11 ⋅151771.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1849661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1849663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84065 + ... + 84086.

It is an arithmetic number, because the mean of its divisors is an integer number (504456).

2^1849661 is an apocalyptic number.

1849661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1849661 is a deficient number, since it is larger than the sum of its proper divisors (168163).

1849661 is a wasteful number, since it uses less digits than its factorization.

1849661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168162.

The product of its digits is 10368, while the sum is 35.

The square root of 1849661 is about 1360.0224262857. The cubic root of 1849661 is about 122.7526038414.

The spelling of 1849661 in words is "one million, eight hundred forty-nine thousand, six hundred sixty-one".