1861457 has 12 divisors (see below), whose sum is σ = 2085300. Its totient is φ = 1651680.

The previous prime is 1861417. The next prime is 1861469. The reversal of 1861457 is 7541681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 246016 + 1615441 = 496^2 + 1271^2 .

It is not a de Polignac number, because 1861457 - 2¹⁴ = 1845073 is a prime.

It is a Duffinian number.

Its product of digits (6720) is a multiple of the sum of its prime factors (224).

It is not an unprimeable number, because it can be changed into a prime (1861417) 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 11 ways as a sum of consecutive naturals, for example, 12419 + ... + 12567.

It is an arithmetic number, because the mean of its divisors is an integer number (173775).

2^1861457 is an apocalyptic number.

It is an amenable number.

1861457 is a deficient number, since it is larger than the sum of its proper divisors (223843).

1861457 is a wasteful number, since it uses less digits than its factorization.

1861457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 193 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 1861457 is about 1364.3522272493. The cubic root of 1861457 is about 123.0129979434.

The spelling of 1861457 in words is "one million, eight hundred sixty-one thousand, four hundred fifty-seven".