2651978 has 12 divisors (see below), whose sum is σ = 4627602. Its totient is φ = 1136520.

The previous prime is 2651959. The next prime is 2651989. The reversal of 2651978 is 8791562.

2651978 is nontrivially palindromic in base 4.

2651978 is digitally balanced in base 2, 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 only one way, i.e., 2569609 + 82369 = 1603^2 + 287^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13433 + ... + 13628.

2^2651978 is an apocalyptic number.

2651978 is a deficient number, since it is larger than the sum of its proper divisors (1975624).

2651978 is a wasteful number, since it uses less digits than its factorization.

2651978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27077 (or 27070 counting only the distinct ones).

The product of its digits is 30240, while the sum is 38.

The square root of 2651978 is about 1628.4894841540. The cubic root of 2651978 is about 138.4171721261.

The spelling of 2651978 in words is "two million, six hundred fifty-one thousand, nine hundred seventy-eight".