2145702540 has 48 divisors (see below), whose sum is σ = 6010996320. Its totient is φ = 571898880.

The previous prime is 2145702539. The next prime is 2145702553. The reversal of 2145702540 is 452075412.

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 = 2145702498 and 2145702507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128260 + ... + 144020.

It is an arithmetic number, because the mean of its divisors is an integer number (125229090).

Almost surely, 2^2145702540 is an apocalyptic number.

2145702540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145702540 is an abundant number, since it is smaller than the sum of its proper divisors (3865293780).

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

2145702540 is a wasteful number, since it uses less digits than its factorization.

2145702540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18042 (or 18040 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 2145702540 is about 46321.7285946887. The cubic root of 2145702540 is about 1289.8023734271.

Adding to 2145702540 its reverse (452075412), we get a palindrome (2597777952).

The spelling of 2145702540 in words is "two billion, one hundred forty-five million, seven hundred two thousand, five hundred forty".