2145273240 has 64 divisors (see below), whose sum is σ = 7020898560. Its totient is φ = 520065920.

The previous prime is 2145273211. The next prime is 2145273241. The reversal of 2145273240 is 423725412.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2145273198 and 2145273207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145273241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811284 + ... + 813923.

It is an arithmetic number, because the mean of its divisors is an integer number (109701540).

Almost surely, 2^2145273240 is an apocalyptic number.

2145273240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145273240 is an abundant number, since it is smaller than the sum of its proper divisors (4875625320).

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

2145273240 is a wasteful number, since it uses less digits than its factorization.

2145273240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625232 (or 1625228 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 2145273240 is about 46317.0944684573. The cubic root of 2145273240 is about 1289.7163489074.

Adding to 2145273240 its reverse (423725412), we get a palindrome (2568998652).

The spelling of 2145273240 in words is "two billion, one hundred forty-five million, two hundred seventy-three thousand, two hundred forty".