2779540 has 12 divisors (see below), whose sum is σ = 5837076. Its totient is φ = 1111808.

The previous prime is 2779537. The next prime is 2779541. The reversal of 2779540 is 459772.

It can be written as a sum of positive squares in 2 ways, for example, as 327184 + 2452356 = 572^2 + 1566^2 .

It is a super-2 number, since 2×2779540² = 15451685223200, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2779496 and 2779505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2779541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69469 + ... + 69508.

It is an arithmetic number, because the mean of its divisors is an integer number (486423).

2^2779540 is an apocalyptic number.

2779540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2779540 is an abundant number, since it is smaller than the sum of its proper divisors (3057536).

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

2779540 is a wasteful number, since it uses less digits than its factorization.

2779540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138986 (or 138984 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 2779540 is about 1667.1952495134. The cubic root of 2779540 is about 140.6018309154.

The spelling of 2779540 in words is "two million, seven hundred seventy-nine thousand, five hundred forty".