1213870 has 16 divisors (see below), whose sum is σ = 2497248. Its totient is φ = 416160.

The previous prime is 1213841. The next prime is 1213873. The reversal of 1213870 is 783121.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213873) 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, 8601 + ... + 8740.

It is an arithmetic number, because the mean of its divisors is an integer number (156078).

2^1213870 is an apocalyptic number.

1213870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213870 is an abundant number, since it is smaller than the sum of its proper divisors (1283378).

1213870 is a wasteful number, since it uses less digits than its factorization.

1213870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17355.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1213870 is about 1101.7576866081. The cubic root of 1213870 is about 106.6737083025.

Adding to 1213870 its reverse (783121), we get a palindrome (1996991).

The spelling of 1213870 in words is "one million, two hundred thirteen thousand, eight hundred seventy".