1806529725 has 216 divisors, whose sum is σ = 4375380672. Its totient is φ = 691891200.

The previous prime is 1806529691. The next prime is 1806529729. The reversal of 1806529725 is 5279256081.

It is not a de Polignac number, because 1806529725 - 2²¹ = 1804432573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1806529729) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 2927617 + ... + 2928233.

It is an arithmetic number, because the mean of its divisors is an integer number (20256392).

Almost surely, 2^1806529725 is an apocalyptic number.

1806529725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1806529725 is an abundant number, since it is smaller than the sum of its proper divisors (2568850947).

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

1806529725 is a wasteful number, since it uses less digits than its factorization.

1806529725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 1806529725 is about 42503.2907549521. The cubic root of 1806529725 is about 1217.9095538976.

The spelling of 1806529725 in words is "one billion, eight hundred six million, five hundred twenty-nine thousand, seven hundred twenty-five".