1864642 has 16 divisors (see below), whose sum is σ = 3117240. Its totient is φ = 830592.

The previous prime is 1864601. The next prime is 1864649. The reversal of 1864642 is 2464681.

It can be written as a sum of positive squares in 4 ways, for example, as 1515361 + 349281 = 1231^2 + 591^2 .

It is not an unprimeable number, because it can be changed into a prime (1864649) 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 7 ways as a sum of consecutive naturals, for example, 483 + ... + 1990.

2^1864642 is an apocalyptic number.

1864642 is a deficient number, since it is larger than the sum of its proper divisors (1252598).

1864642 is a wasteful number, since it uses less digits than its factorization.

1864642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517.

The product of its digits is 9216, while the sum is 31.

The square root of 1864642 is about 1365.5189489714. The cubic root of 1864642 is about 123.0831174166.

The spelling of 1864642 in words is "one million, eight hundred sixty-four thousand, six hundred forty-two".