618973440 has 144 divisors (see below), whose sum is σ = 1986768000. Its totient is φ = 164233216.

The previous prime is 618973427. The next prime is 618973441. The reversal of 618973440 is 44379816.

It is a junction number, because it is equal to n+sod(n) for n = 618973392 and 618973401.

It is not an unprimeable number, because it can be changed into a prime (618973441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1378336 + ... + 1378784.

It is an arithmetic number, because the mean of its divisors is an integer number (13797000).

Almost surely, 2^618973440 is an apocalyptic number.

618973440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618973440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993384000).

618973440 is an abundant number, since it is smaller than the sum of its proper divisors (1367794560).

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

618973440 is a wasteful number, since it uses less digits than its factorization.

618973440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 618973440 is about 24879.1768352572. The cubic root of 618973440 is about 852.2310202511.

The spelling of 618973440 in words is "six hundred eighteen million, nine hundred seventy-three thousand, four hundred forty".