612381 has 24 divisors (see below), whose sum is σ = 1029952. Its totient is φ = 316800.

The previous prime is 612377. The next prime is 612383. The reversal of 612381 is 183216.

It is not a de Polignac number, because 612381 - 2² = 612377 is a prime.

It is a super-2 number, since 2×612381² = 750020978322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

612381 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 612381.

It is not an unprimeable number, because it can be changed into a prime (612383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2421 + ... + 2661.

2⁶¹²³⁸¹ is an apocalyptic number.

It is an amenable number.

612381 is a deficient number, since it is larger than the sum of its proper divisors (417571).

612381 is a wasteful number, since it uses less digits than its factorization.

612381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 262 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 612381 is about 782.5477621206. The cubic root of 612381 is about 84.9194623535.

612381 divided by its sum of digits (21) gives a triangular number (29161 = T₂₄₁).

Adding to 612381 its reverse (183216), we get a palindrome (795597).

It can be divided in two parts, 61 and 2381, that added together give a palindrome (2442).

The spelling of 612381 in words is "six hundred twelve thousand, three hundred eighty-one".