1858149 has 6 divisors (see below), whose sum is σ = 2684006. Its totient is φ = 1238760.

The previous prime is 1858139. The next prime is 1858163. The reversal of 1858149 is 9418581.

It can be written as a sum of positive squares in only one way, i.e., 1476225 + 381924 = 1215^2 + 618^2 .

It is not a de Polignac number, because 1858149 - 2⁴ = 1858133 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1858139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103222 + ... + 103239.

2^1858149 is an apocalyptic number.

It is an amenable number.

1858149 is a deficient number, since it is larger than the sum of its proper divisors (825857).

1858149 is a wasteful number, since it uses less digits than its factorization.

1858149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206467 (or 206464 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 1858149 is about 1363.1393912583. The cubic root of 1858149 is about 122.9400858310.

The spelling of 1858149 in words is "one million, eight hundred fifty-eight thousand, one hundred forty-nine".