2155927774 has 48 divisors (see below), whose sum is σ = 4419572976. Its totient is φ = 775353600.

The previous prime is 2155927771. The next prime is 2155927783. The reversal of 2155927774 is 4777295512.

It is a super-3 number, since 3×2155927774³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155927771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62907 + ... + 90934.

It is an arithmetic number, because the mean of its divisors is an integer number (92074437).

Almost surely, 2^2155927774 is an apocalyptic number.

2155927774 is an abundant number, since it is smaller than the sum of its proper divisors (2263645202).

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

2155927774 is a wasteful number, since it uses less digits than its factorization.

2155927774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153881 (or 153874 counting only the distinct ones).

The product of its digits is 1234800, while the sum is 49.

The square root of 2155927774 is about 46431.9693099485. The cubic root of 2155927774 is about 1291.8479562252.

It can be divided in two parts, 2155 and 927774, that added together give a palindrome (929929).

The spelling of 2155927774 in words is "two billion, one hundred fifty-five million, nine hundred twenty-seven thousand, seven hundred seventy-four".