2157278395 has 16 divisors (see below), whose sum is σ = 2688491520. Its totient is φ = 1660516704.

The previous prime is 2157278381. The next prime is 2157278401. The reversal of 2157278395 is 5938727512.

It is a cyclic number.

It is not a de Polignac number, because 2157278395 - 2⁵ = 2157278363 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60475 + ... + 89284.

It is an arithmetic number, because the mean of its divisors is an integer number (168030720).

Almost surely, 2^2157278395 is an apocalyptic number.

2157278395 is a deficient number, since it is larger than the sum of its proper divisors (531213125).

2157278395 is a wasteful number, since it uses less digits than its factorization.

2157278395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149874.

The product of its digits is 1058400, while the sum is 49.

The square root of 2157278395 is about 46446.5111176286. The cubic root of 2157278395 is about 1292.1176672939.

The spelling of 2157278395 in words is "two billion, one hundred fifty-seven million, two hundred seventy-eight thousand, three hundred ninety-five".