2157980378 has 16 divisors (see below), whose sum is σ = 3335113320. Its totient is φ = 1046462976.

The previous prime is 2157980369. The next prime is 2157980417. The reversal of 2157980378 is 8730897512.

It can be written as a sum of positive squares in 4 ways, for example, as 2100113929 + 57866449 = 45827^2 + 7607^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23423 + ... + 69746.

Almost surely, 2^2157980378 is an apocalyptic number.

2157980378 is a deficient number, since it is larger than the sum of its proper divisors (1177132942).

2157980378 is a wasteful number, since it uses less digits than its factorization.

2157980378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93521.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 2157980378 is about 46454.0673999597. The cubic root of 2157980378 is about 1292.2578047114.

The spelling of 2157980378 in words is "two billion, one hundred fifty-seven million, nine hundred eighty thousand, three hundred seventy-eight".