2581394 has 8 divisors (see below), whose sum is σ = 3897228. Its totient is φ = 1282320.

The previous prime is 2581393. The next prime is 2581409. The reversal of 2581394 is 4931852.

2581394 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 2 ways, for example, as 2512225 + 69169 = 1585^2 + 263^2 .

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

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2581394.

It is not an unprimeable number, because it can be changed into a prime (2581391) 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 3 ways as a sum of consecutive naturals, for example, 3797 + ... + 4424.

2^2581394 is an apocalyptic number.

2581394 is a deficient number, since it is larger than the sum of its proper divisors (1315834).

2581394 is a wasteful number, since it uses less digits than its factorization.

2581394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8380.

The product of its digits is 8640, while the sum is 32.

The square root of 2581394 is about 1606.6717150681. The cubic root of 2581394 is about 137.1780943474.

The spelling of 2581394 in words is "two million, five hundred eighty-one thousand, three hundred ninety-four".