1816397460 has 120 divisors (see below), whose sum is σ = 5713225056. Its totient is φ = 483088320.

The previous prime is 1816397441. The next prime is 1816397497. The reversal of 1816397460 is 647936181.

It is a happy number.

1816397460 is a `hidden beast` number, since 1 + 8 + 1 + 639 + 7 + 4 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 716395 + ... + 718925.

Almost surely, 2^1816397460 is an apocalyptic number.

1816397460 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 1816397460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2856612528).

1816397460 is an abundant number, since it is smaller than the sum of its proper divisors (3896827596).

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

1816397460 is a wasteful number, since it uses less digits than its factorization.

1816397460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2995 (or 2984 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1816397460 is about 42619.2146807048. The cubic root of 1816397460 is about 1220.1230414290.

The spelling of 1816397460 in words is "one billion, eight hundred sixteen million, three hundred ninety-seven thousand, four hundred sixty".