2156509406 has 8 divisors (see below), whose sum is σ = 3322190280. Its totient is φ = 1049112648.

The previous prime is 2156509363. The next prime is 2156509409. The reversal of 2156509406 is 6049056512.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2156509406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156509409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14570936 + ... + 14571083.

It is an arithmetic number, because the mean of its divisors is an integer number (415273785).

Almost surely, 2^2156509406 is an apocalyptic number.

2156509406 is a deficient number, since it is larger than the sum of its proper divisors (1165680874).

2156509406 is a wasteful number, since it uses less digits than its factorization.

2156509406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29142058.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 2156509406 is about 46438.2321584274. The cubic root of 2156509406 is about 1291.9641185197.

The spelling of 2156509406 in words is "two billion, one hundred fifty-six million, five hundred nine thousand, four hundred six".