618438 has 16 divisors (see below), whose sum is σ = 1258560. Its totient is φ = 202536.

The previous prime is 618437. The next prime is 618439. The reversal of 618438 is 834816.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (618437) and next prime (618439).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618437) 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, 520 + ... + 1227.

It is an arithmetic number, because the mean of its divisors is an integer number (78660).

2⁶¹⁸⁴³⁸ is an apocalyptic number.

618438 is an abundant number, since it is smaller than the sum of its proper divisors (640122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

618438 is a wasteful number, since it uses less digits than its factorization.

618438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811.

The product of its digits is 4608, while the sum is 30.

The square root of 618438 is about 786.4082909024. The cubic root of 618438 is about 85.1985209909.

The spelling of 618438 in words is "six hundred eighteen thousand, four hundred thirty-eight".