1816811460 has 72 divisors (see below), whose sum is σ = 5521193496. Its totient is φ = 483586560.

The previous prime is 1816811443. The next prime is 1816811489. The reversal of 1816811460 is 641186181.

1816811460 is a `hidden beast` number, since 181 + 6 + 8 + 11 + 460 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6084 + 1816805376 = 78^2 + 42624^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91200 + ... + 109320.

It is an arithmetic number, because the mean of its divisors is an integer number (76683243).

Almost surely, 2^1816811460 is an apocalyptic number.

1816811460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1816811460 is an abundant number, since it is smaller than the sum of its proper divisors (3704382036).

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

1816811460 is a wasteful number, since it uses less digits than its factorization.

1816811460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18693 (or 18688 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1816811460 is about 42624.0713681835. The cubic root of 1816811460 is about 1220.2157326999.

The spelling of 1816811460 in words is "one billion, eight hundred sixteen million, eight hundred eleven thousand, four hundred sixty".