2523781 has 8 divisors (see below), whose sum is σ = 2751840. Its totient is φ = 2300592.

The previous prime is 2523779. The next prime is 2523791. The reversal of 2523781 is 1873252.

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

It is a cyclic number.

It is not a de Polignac number, because 2523781 - 2¹ = 2523779 is a prime.

It is a super-2 number, since 2×2523781² = 12738941071922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2523791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91 + ... + 2248.

It is an arithmetic number, because the mean of its divisors is an integer number (343980).

2^2523781 is an apocalyptic number.

It is an amenable number.

2523781 is a deficient number, since it is larger than the sum of its proper divisors (228059).

2523781 is a wasteful number, since it uses less digits than its factorization.

2523781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435.

The product of its digits is 3360, while the sum is 28.

The square root of 2523781 is about 1588.6412433271. The cubic root of 2523781 is about 136.1498672304.

The spelling of 2523781 in words is "two million, five hundred twenty-three thousand, seven hundred eighty-one".