2787961 has 6 divisors (see below), whose sum is σ = 3064586. Its totient is φ = 2534400.

The previous prime is 2787947. The next prime is 2787971. The reversal of 2787961 is 1697872.

2787961 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., 2013561 + 774400 = 1419^2 + 880^2 .

It is not a de Polignac number, because 2787961 - 2¹³ = 2779769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2787931) by changing a digit.

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, 11400 + ... + 11641.

2^2787961 is an apocalyptic number.

It is an amenable number.

2787961 is a deficient number, since it is larger than the sum of its proper divisors (276625).

2787961 is a wasteful number, since it uses less digits than its factorization.

2787961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23063 (or 23052 counting only the distinct ones).

The product of its digits is 42336, while the sum is 40.

The square root of 2787961 is about 1669.7188386073. The cubic root of 2787961 is about 140.7436786458.

The spelling of 2787961 in words is "two million, seven hundred eighty-seven thousand, nine hundred sixty-one".