1820973252 has 24 divisors (see below), whose sum is σ = 4855928896. Its totient is φ = 520278048.

The previous prime is 1820973251. The next prime is 1820973257. The reversal of 1820973252 is 2523790281.

It is a self number, because there is not a number n which added to its sum of digits gives 1820973252.

It is not an unprimeable number, because it can be changed into a prime (1820973251) 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, 10839043 + ... + 10839210.

Almost surely, 2^1820973252 is an apocalyptic number.

1820973252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1820973252 is an abundant number, since it is smaller than the sum of its proper divisors (3034955644).

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

1820973252 is a wasteful number, since it uses less digits than its factorization.

1820973252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21678267 (or 21678265 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 1820973252 is about 42672.8631802461. The cubic root of 1820973252 is about 1221.1467431513.

The spelling of 1820973252 in words is "one billion, eight hundred twenty million, nine hundred seventy-three thousand, two hundred fifty-two".