1864438 has 4 divisors (see below), whose sum is σ = 2796660. Its totient is φ = 932218.

The previous prime is 1864427. The next prime is 1864453. The reversal of 1864438 is 8344681.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1864438² = 6952258111688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 466108 + ... + 466111.

It is an arithmetic number, because the mean of its divisors is an integer number (699165).

2^1864438 is an apocalyptic number.

1864438 is a deficient number, since it is larger than the sum of its proper divisors (932222).

1864438 is an equidigital number, since it uses as much as digits as its factorization.

1864438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932221.

The product of its digits is 18432, while the sum is 34.

The square root of 1864438 is about 1365.4442500520. Note that the first 3 decimals coincide. The cubic root of 1864438 is about 123.0786286422.

It can be divided in two parts, 186 and 4438, that added together give a square (4624 = 68²).

The spelling of 1864438 in words is "one million, eight hundred sixty-four thousand, four hundred thirty-eight".