2156909387 has 8 divisors (see below), whose sum is σ = 2255122080. Its totient is φ = 2059066240.

The previous prime is 2156909371. The next prime is 2156909411. The reversal of 2156909387 is 7839096512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2156909387 - 2⁴ = 2156909371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156906387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80414 + ... + 103827.

It is an arithmetic number, because the mean of its divisors is an integer number (281890260).

Almost surely, 2^2156909387 is an apocalyptic number.

2156909387 is a deficient number, since it is larger than the sum of its proper divisors (98212693).

2156909387 is a wasteful number, since it uses less digits than its factorization.

2156909387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184773.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 2156909387 is about 46442.5385503420. The cubic root of 2156909387 is about 1292.0439897463.

The spelling of 2156909387 in words is "two billion, one hundred fifty-six million, nine hundred nine thousand, three hundred eighty-seven".