2925781 has 8 divisors (see below), whose sum is σ = 3046680. Its totient is φ = 2806272.

The previous prime is 2925779. The next prime is 2925799. The reversal of 2925781 is 1875292.

2925781 = 1209² + 1210².

2925781 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 4 ways, for example, as 1681 + 2924100 = 41^2 + 1710^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2925781 - 2¹ = 2925779 is a prime.

It is a super-2 number, since 2×2925781² = 17120388919922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2925721) 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 7 ways as a sum of consecutive naturals, for example, 6541 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (380835).

2^2925781 is an apocalyptic number.

2925781 is the 1210-th centered square number.

It is an amenable number.

2925781 is a deficient number, since it is larger than the sum of its proper divisors (120899).

2925781 is a wasteful number, since it uses less digits than its factorization.

2925781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695.

The product of its digits is 10080, while the sum is 34.

The square root of 2925781 is about 1710.4914498471. The cubic root of 2925781 is about 143.0256527242.

The spelling of 2925781 in words is "two million, nine hundred twenty-five thousand, seven hundred eighty-one".