1818627440 has 80 divisors (see below), whose sum is σ = 4854355968. Its totient is φ = 620690688.

The previous prime is 1818627413. The next prime is 1818627463. The reversal of 1818627440 is 447268181.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117599 + ... + 132161.

Almost surely, 2^1818627440 is an apocalyptic number.

1818627440 is a gapful number since it is divisible by the number (10) 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 1818627440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2427177984).

1818627440 is an abundant number, since it is smaller than the sum of its proper divisors (3035728528).

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

1818627440 is a wasteful number, since it uses less digits than its factorization.

1818627440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14806 (or 14800 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 1818627440 is about 42645.3683299840. The cubic root of 1818627440 is about 1220.6221497541.

The spelling of 1818627440 in words is "one billion, eight hundred eighteen million, six hundred twenty-seven thousand, four hundred forty".