1821930490 has 16 divisors (see below), whose sum is σ = 3280290048. Its totient is φ = 728591056.

The previous prime is 1821930457. The next prime is 1821930497. The reversal of 1821930490 is 940391281.

It is not an unprimeable number, because it can be changed into a prime (1821930497) 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, 24219 + ... + 65041.

It is an arithmetic number, because the mean of its divisors is an integer number (205018128).

Almost surely, 2^1821930490 is an apocalyptic number.

1821930490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1821930490 is a deficient number, since it is larger than the sum of its proper divisors (1458359558).

1821930490 is a wasteful number, since it uses less digits than its factorization.

1821930490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45293.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1821930490 is about 42684.0777105468. The cubic root of 1821930490 is about 1221.3606806341.

The spelling of 1821930490 in words is "one billion, eight hundred twenty-one million, nine hundred thirty thousand, four hundred ninety".