2509816 has 8 divisors (see below), whose sum is σ = 4705920. Its totient is φ = 1254904.

The previous prime is 2509811. The next prime is 2509823. The reversal of 2509816 is 6189052.

It is a tau number, because it is divible by the number of its divisors (8).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2509811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156856 + ... + 156871.

It is an arithmetic number, because the mean of its divisors is an integer number (588240).

2^2509816 is an apocalyptic number.

It is an amenable number.

2509816 is a deficient number, since it is larger than the sum of its proper divisors (2196104).

2509816 is a wasteful number, since it uses less digits than its factorization.

2509816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313733 (or 313729 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2509816 is about 1584.2398808261. The cubic root of 2509816 is about 135.8982803403.

The spelling of 2509816 in words is "two million, five hundred nine thousand, eight hundred sixteen".