2156477 has 8 divisors (see below), whose sum is σ = 2230200. Its totient is φ = 2083840.

The previous prime is 2156461. The next prime is 2156491. The reversal of 2156477 is 7746512.

It can be written as a sum of positive squares in 4 ways, for example, as 51076 + 2105401 = 226^2 + 1451^2 .

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 2156477 - 2⁴ = 2156461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5933 + ... + 6285.

It is an arithmetic number, because the mean of its divisors is an integer number (278775).

2^2156477 is an apocalyptic number.

It is an amenable number.

2156477 is a deficient number, since it is larger than the sum of its proper divisors (73723).

2156477 is a wasteful number, since it uses less digits than its factorization.

2156477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543.

The product of its digits is 11760, while the sum is 32.

The square root of 2156477 is about 1468.4948076177. The cubic root of 2156477 is about 129.1957647012.

The spelling of 2156477 in words is "two million, one hundred fifty-six thousand, four hundred seventy-seven".