618240381 has 16 divisors (see below), whose sum is σ = 911927808. Its totient is φ = 369412400.

The previous prime is 618240367. The next prime is 618240421. The reversal of 618240381 is 183042816.

It is a cyclic number.

It is not a de Polignac number, because 618240381 - 2⁵ = 618240349 is a prime.

It is a super-2 number, since 2×618240381² = 764442337398050322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618240331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129591 + ... + 134276.

It is an arithmetic number, because the mean of its divisors is an integer number (56995488).

Almost surely, 2^618240381 is an apocalyptic number.

It is an amenable number.

618240381 is a deficient number, since it is larger than the sum of its proper divisors (293687427).

618240381 is a wasteful number, since it uses less digits than its factorization.

618240381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263952.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 618240381 is about 24864.4400902172. The cubic root of 618240381 is about 851.8944509310.

The spelling of 618240381 in words is "six hundred eighteen million, two hundred forty thousand, three hundred eighty-one".