1836621 has 8 divisors (see below), whose sum is σ = 2720960. Its totient is φ = 1224396.

The previous prime is 1836581. The next prime is 1836623. The reversal of 1836621 is 1266381.

1836621 is a `hidden beast` number, since 1 + 8 + 36 + 621 = 666.

It is not a de Polignac number, because 1836621 - 2¹⁴ = 1820237 is a prime.

It is a super-3 number, since 3×1836621³ = 18585741478794333183, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 68023 = 1836621 / (1 + 8 + 3 + 6 + 6 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1836623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33985 + ... + 34038.

It is an arithmetic number, because the mean of its divisors is an integer number (340120).

2^1836621 is an apocalyptic number.

It is an amenable number.

1836621 is a deficient number, since it is larger than the sum of its proper divisors (884339).

1836621 is an equidigital number, since it uses as much as digits as its factorization.

1836621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68032 (or 68026 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1836621 is about 1355.2199083544. The cubic root of 1836621 is about 122.4634570994.

The spelling of 1836621 in words is "one million, eight hundred thirty-six thousand, six hundred twenty-one".