1820797525 has 12 divisors (see below), whose sum is σ = 2296058400. Its totient is φ = 1431948080.

The previous prime is 1820797523. The next prime is 1820797543. The reversal of 1820797525 is 5257970281.

It is a happy number.

It is not a de Polignac number, because 1820797525 - 2¹ = 1820797523 is a prime.

It is a super-2 number, since 2×1820797525² = 6630607254092251250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820797523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 615745 + ... + 618694.

It is an arithmetic number, because the mean of its divisors is an integer number (191338200).

Almost surely, 2^1820797525 is an apocalyptic number.

It is an amenable number.

1820797525 is a deficient number, since it is larger than the sum of its proper divisors (475260875).

1820797525 is a wasteful number, since it uses less digits than its factorization.

1820797525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234508 (or 1234503 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 46.

The square root of 1820797525 is about 42670.8041288186. The cubic root of 1820797525 is about 1221.1074609787.

The spelling of 1820797525 in words is "one billion, eight hundred twenty million, seven hundred ninety-seven thousand, five hundred twenty-five".