1825720540 has 24 divisors (see below), whose sum is σ = 4381729632. Its totient is φ = 625961280.

The previous prime is 1825720493. The next prime is 1825720543. The reversal of 1825720540 is 450275281.

It is a happy number.

It is a super-4 number, since 4×1825720540⁴ (a number of 38 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1825720496 and 1825720505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1825720543) 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, 6520291 + ... + 6520570.

It is an arithmetic number, because the mean of its divisors is an integer number (182572068).

Almost surely, 2^1825720540 is an apocalyptic number.

1825720540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1825720540 is an abundant number, since it is smaller than the sum of its proper divisors (2556009092).

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

1825720540 is a wasteful number, since it uses less digits than its factorization.

1825720540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13040877 (or 13040875 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 1825720540 is about 42728.4511771723. The cubic root of 1825720540 is about 1222.2070012368.

The spelling of 1825720540 in words is "one billion, eight hundred twenty-five million, seven hundred twenty thousand, five hundred forty".