618440 has 16 divisors (see below), whose sum is σ = 1391580. Its totient is φ = 247360.

The previous prime is 618439. The next prime is 618463. The reversal of 618440 is 44816.

618440 = T₂₇₀ + T₂₇₁ + ... + T₂₈₅.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 586756 + 31684 = 766^2 + 178^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7691 + ... + 7770.

2⁶¹⁸⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

618440 is an abundant number, since it is smaller than the sum of its proper divisors (773140).

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

618440 is a wasteful number, since it uses less digits than its factorization.

618440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15472 (or 15468 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 618440 is about 786.4095625054. The cubic root of 618440 is about 85.1986128335.

The spelling of 618440 in words is "six hundred eighteen thousand, four hundred forty".