2145254540 has 96 divisors (see below), whose sum is σ = 5304870144. Its totient is φ = 718421760.

The previous prime is 2145254519. The next prime is 2145254557. The reversal of 2145254540 is 454525412.

It is a super-2 number, since 2×2145254540² = 9204234082781223200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2145254497 and 2145254506.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2364767 + ... + 2365673.

It is an arithmetic number, because the mean of its divisors is an integer number (55259064).

Almost surely, 2^2145254540 is an apocalyptic number.

2145254540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145254540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2652435072).

2145254540 is an abundant number, since it is smaller than the sum of its proper divisors (3159615604).

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

2145254540 is a wasteful number, since it uses less digits than its factorization.

2145254540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767 (or 1765 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 32.

The square root of 2145254540 is about 46316.8925987053. The cubic root of 2145254540 is about 1289.7126014802.

Adding to 2145254540 its reverse (454525412), we get a palindrome (2599779952).

The spelling of 2145254540 in words is "two billion, one hundred forty-five million, two hundred fifty-four thousand, five hundred forty".