1864381 has 8 divisors (see below), whose sum is σ = 1966680. Its totient is φ = 1764672.

The previous prime is 1864363. The next prime is 1864391. The reversal of 1864381 is 1834681.

1864381 = T₂₂₄ + T₂₂₅ + ... + T₂₈₁.

1864381 = 965² + 966².

It can be written as a sum of positive squares in 4 ways, for example, as 95481 + 1768900 = 309^2 + 1330^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1864381 - 2⁷ = 1864253 is a prime.

It is a super-2 number, since 2×1864381² = 6951833026322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864361) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 931 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (245835).

2^1864381 is an apocalyptic number.

1864381 is the 966-th centered square number.

It is an amenable number.

1864381 is a deficient number, since it is larger than the sum of its proper divisors (102299).

1864381 is a wasteful number, since it uses less digits than its factorization.

1864381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295.

The product of its digits is 4608, while the sum is 31.

The square root of 1864381 is about 1365.4233775646. The cubic root of 1864381 is about 123.0773743673.

The spelling of 1864381 in words is "one million, eight hundred sixty-four thousand, three hundred eighty-one".