12617820 has 36 divisors (see below), whose sum is σ = 38274600. Its totient is φ = 3364704.

The previous prime is 12617819. The next prime is 12617821. The reversal of 12617820 is 2871621.

It is an interprime number because it is at equal distance from previous prime (12617819) and next prime (12617821).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12617821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34870 + ... + 35229.

Almost surely, 2^12617820 is an apocalyptic number.

12617820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12617820 is an abundant number, since it is smaller than the sum of its proper divisors (25656780).

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

12617820 is a wasteful number, since it uses less digits than its factorization.

12617820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70114 (or 70109 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 12617820 is about 3552.1570911208. The cubic root of 12617820 is about 232.8063253321.

The spelling of 12617820 in words is "twelve million, six hundred seventeen thousand, eight hundred twenty".