12505890 has 32 divisors (see below), whose sum is σ = 30113856. Its totient is φ = 3323840.

The previous prime is 12505879. The next prime is 12505891. The reversal of 12505890 is 9850521.

It is a Harshad number since it is a multiple of its sum of digits (30).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12505891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12820 + ... + 13760.

It is an arithmetic number, because the mean of its divisors is an integer number (941058).

Almost surely, 2^12505890 is an apocalyptic number.

12505890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12505890 is an abundant number, since it is smaller than the sum of its proper divisors (17607966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12505890 is a wasteful number, since it uses less digits than its factorization.

12505890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 12505890 is about 3536.3667796200. The cubic root of 12505890 is about 232.1158879011.

It can be divided in two parts, 1250 and 5890, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 12505890 in words is "twelve million, five hundred five thousand, eight hundred ninety".