2145202040 has 32 divisors (see below), whose sum is σ = 4829971680. Its totient is φ = 857500032.

The previous prime is 2145202039. The next prime is 2145202043. The reversal of 2145202040 is 402025412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145202043) 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, 44342 + ... + 79098.

It is an arithmetic number, because the mean of its divisors is an integer number (150936615).

Almost surely, 2^2145202040 is an apocalyptic number.

2145202040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145202040 is an abundant number, since it is smaller than the sum of its proper divisors (2684769640).

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

2145202040 is a wasteful number, since it uses less digits than its factorization.

2145202040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36311 (or 36307 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 2145202040 is about 46316.3258473727. The cubic root of 2145202040 is about 1289.7020805121.

Adding to 2145202040 its reverse (402025412), we get a palindrome (2547227452).

The spelling of 2145202040 in words is "two billion, one hundred forty-five million, two hundred two thousand, forty".