2155557 has 8 divisors (see below), whose sum is σ = 2921440. Its totient is φ = 1413360.

The previous prime is 2155519. The next prime is 2155579. The reversal of 2155557 is 7555512.

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

It is not a de Polignac number, because 2155557 - 2⁷ = 2155429 is a prime.

It is a Duffinian number.

2155557 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155597) 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, 5707 + ... + 6072.

It is an arithmetic number, because the mean of its divisors is an integer number (365180).

2^2155557 is an apocalyptic number.

It is an amenable number.

2155557 is a deficient number, since it is larger than the sum of its proper divisors (765883).

2155557 is a wasteful number, since it uses less digits than its factorization.

2155557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11843.

The product of its digits is 8750, while the sum is 30.

The square root of 2155557 is about 1468.1815282859. The cubic root of 2155557 is about 129.1773895133.

It can be divided in two parts, 21555 and 57, that added together give a palindrome (21612).

The spelling of 2155557 in words is "two million, one hundred fifty-five thousand, five hundred fifty-seven".