2145615440 has 40 divisors (see below), whose sum is σ = 5006236128. Its totient is φ = 855204480.

The previous prime is 2145615401. The next prime is 2145615443. The reversal of 2145615440 is 445165412.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 2145615397 and 2145615406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145615443) 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, 24746 + ... + 70025.

Almost surely, 2^2145615440 is an apocalyptic number.

2145615440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145615440 is an abundant number, since it is smaller than the sum of its proper divisors (2860620688).

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

2145615440 is a wasteful number, since it uses less digits than its factorization.

2145615440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95067 (or 95061 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 2145615440 is about 46320.7884216148. The cubic root of 2145615440 is about 1289.7849209758.

The spelling of 2145615440 in words is "two billion, one hundred forty-five million, six hundred fifteen thousand, four hundred forty".