2549778 has 32 divisors (see below), whose sum is σ = 6359040. Its totient is φ = 662160.

The previous prime is 2549773. The next prime is 2549783. The reversal of 2549778 is 8779452.

It is an interprime number because it is at equal distance from previous prime (2549773) and next prime (2549783).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2549773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2298 + ... + 3221.

It is an arithmetic number, because the mean of its divisors is an integer number (198720).

2^2549778 is an apocalyptic number.

2549778 is an abundant number, since it is smaller than the sum of its proper divisors (3809262).

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

2549778 is a wasteful number, since it uses less digits than its factorization.

2549778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5542.

The product of its digits is 141120, while the sum is 42.

The square root of 2549778 is about 1596.8024298579. The cubic root of 2549778 is about 136.6157560389.

The spelling of 2549778 in words is "two million, five hundred forty-nine thousand, seven hundred seventy-eight".