2503906 has 4 divisors (see below), whose sum is σ = 3755862. Its totient is φ = 1251952.

The previous prime is 2503883. The next prime is 2503909. The reversal of 2503906 is 6093052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1666681 + 837225 = 1291^2 + 915^2 .

It is not an unprimeable number, because it can be changed into a prime (2503909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625975 + ... + 625978.

2^2503906 is an apocalyptic number.

2503906 is a deficient number, since it is larger than the sum of its proper divisors (1251956).

2503906 is a wasteful number, since it uses less digits than its factorization.

2503906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251955.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 2503906 is about 1582.3735336513. The cubic root of 2503906 is about 135.7915274845.

Adding to 2503906 its reverse (6093052), we get a palindrome (8596958).

The spelling of 2503906 in words is "two million, five hundred three thousand, nine hundred six".