2145105438 has 96 divisors (see below), whose sum is σ = 5105332224. Its totient is φ = 598969728.

The previous prime is 2145105409. The next prime is 2145105449. The reversal of 2145105438 is 8345015412.

It is a junction number, because it is equal to n+sod(n) for n = 2145105399 and 2145105408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2725281 + ... + 2726067.

It is an arithmetic number, because the mean of its divisors is an integer number (53180544).

Almost surely, 2^2145105438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145105438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2552666112).

2145105438 is an abundant number, since it is smaller than the sum of its proper divisors (2960226786).

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

2145105438 is a wasteful number, since it uses less digits than its factorization.

2145105438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006 (or 999 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 2145105438 is about 46315.2829852091. The cubic root of 2145105438 is about 1289.6827210814.

The spelling of 2145105438 in words is "two billion, one hundred forty-five million, one hundred five thousand, four hundred thirty-eight".