2156738490 has 48 divisors (see below), whose sum is σ = 5937378408. Its totient is φ = 541298688.

The previous prime is 2156738489. The next prime is 2156738503. The reversal of 2156738490 is 948376512.

2156738490 is a `hidden beast` number, since 2 + 1 + 567 + 3 + 84 + 9 + 0 = 666.

2156738490 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1262309841 + 894428649 = 35529^2 + 29907^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

2156738490 is strictly pandigital in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 703287 + ... + 706346.

It is a 1-persistent number, because it is pandigital, but 2⋅2156738490 = 4313476980 is not.

Almost surely, 2^2156738490 is an apocalyptic number.

2156738490 is an abundant number, since it is smaller than the sum of its proper divisors (3780639918).

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

2156738490 is a wasteful number, since it uses less digits than its factorization.

2156738490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409663 (or 1409660 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 2156738490 is about 46440.6986381557. The cubic root of 2156738490 is about 1292.0098649510.

The spelling of 2156738490 in words is "two billion, one hundred fifty-six million, seven hundred thirty-eight thousand, four hundred ninety".