1872149 has 2 divisors, whose sum is σ = 1872150. Its totient is φ = 1872148.

The previous prime is 1872137. The next prime is 1872173. The reversal of 1872149 is 9412781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1423249 + 448900 = 1193^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872149 - 2²⁰ = 823573 is a prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1872109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936074 + 936075.

It is an arithmetic number, because the mean of its divisors is an integer number (936075).

2^1872149 is an apocalyptic number.

It is an amenable number.

1872149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872149 is an equidigital number, since it uses as much as digits as its factorization.

1872149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 1872149 is about 1368.2649597209. The cubic root of 1872149 is about 123.2480727179.

The spelling of 1872149 in words is "one million, eight hundred seventy-two thousand, one hundred forty-nine".