2145540042 has 32 divisors (see below), whose sum is σ = 4769486400. Its totient is φ = 714937104.

The previous prime is 2145539987. The next prime is 2145540043. The reversal of 2145540042 is 2400455412.

2145540042 is a `hidden beast` number, since 214 + 5 + 5 + 400 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 2145539988 and 2145540015.

It is not an unprimeable number, because it can be changed into a prime (2145540043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229728 + ... + 238884.

It is an arithmetic number, because the mean of its divisors is an integer number (149046450).

Almost surely, 2^2145540042 is an apocalyptic number.

2145540042 is an abundant number, since it is smaller than the sum of its proper divisors (2623946358).

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

2145540042 is a wasteful number, since it uses less digits than its factorization.

2145540042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13507 (or 13501 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 2145540042 is about 46319.9745466251. The cubic root of 2145540042 is about 1289.7698129031.

Adding to 2145540042 its reverse (2400455412), we get a palindrome (4545995454).

The spelling of 2145540042 in words is "two billion, one hundred forty-five million, five hundred forty thousand, forty-two".