1812920530 has 16 divisors (see below), whose sum is σ = 3435007680. Its totient is φ = 687001392.

The previous prime is 1812920521. The next prime is 1812920537. The reversal of 1812920530 is 350292181.

It is a junction number, because it is equal to n+sod(n) for n = 1812920492 and 1812920501.

It is not an unprimeable number, because it can be changed into a prime (1812920537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4770654 + ... + 4771033.

It is an arithmetic number, because the mean of its divisors is an integer number (214687980).

Almost surely, 2^1812920530 is an apocalyptic number.

1812920530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1812920530 is a deficient number, since it is larger than the sum of its proper divisors (1622087150).

1812920530 is a wasteful number, since it uses less digits than its factorization.

1812920530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9541713.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1812920530 is about 42578.4045027523. The cubic root of 1812920530 is about 1219.3440283500.

The spelling of 1812920530 in words is "one billion, eight hundred twelve million, nine hundred twenty thousand, five hundred thirty".