1821490970 has 32 divisors (see below), whose sum is σ = 3533256720. Its totient is φ = 672099840.

The previous prime is 1821490919. The next prime is 1821490987. The reversal of 1821490970 is 790941281.

It can be written as a sum of positive squares in 8 ways, for example, as 5793649 + 1815697321 = 2407^2 + 42611^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238166 + ... + 245694.

Almost surely, 2^1821490970 is an apocalyptic number.

1821490970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1821490970 is a deficient number, since it is larger than the sum of its proper divisors (1711765750).

1821490970 is a wasteful number, since it uses less digits than its factorization.

1821490970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9410.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1821490970 is about 42678.9288759688. The cubic root of 1821490970 is about 1221.2624596131.

The spelling of 1821490970 in words is "one billion, eight hundred twenty-one million, four hundred ninety thousand, nine hundred seventy".