2149434378 has 96 divisors (see below), whose sum is σ = 5865315456. Its totient is φ = 553682304.

The previous prime is 2149434361. The next prime is 2149434379. The reversal of 2149434378 is 8734349412.

2149434378 is a `hidden beast` number, since 2 + 149 + 434 + 3 + 78 = 666.

It is not an unprimeable number, because it can be changed into a prime (2149434379) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55176 + ... + 85692.

It is an arithmetic number, because the mean of its divisors is an integer number (61097036).

Almost surely, 2^2149434378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2149434378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2932657728).

2149434378 is an abundant number, since it is smaller than the sum of its proper divisors (3715881078).

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

2149434378 is a wasteful number, since it uses less digits than its factorization.

2149434378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30588 (or 30585 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 2149434378 is about 46361.9928173930. The cubic root of 2149434378 is about 1290.5496882170.

The spelling of 2149434378 in words is "two billion, one hundred forty-nine million, four hundred thirty-four thousand, three hundred seventy-eight".