1216890 has 32 divisors (see below), whose sum is σ = 3245760. Its totient is φ = 324432.

The previous prime is 1216879. The next prime is 1216903. The reversal of 1216890 is 986121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1984 + ... + 2523.

It is an arithmetic number, because the mean of its divisors is an integer number (101430).

2^1216890 is an apocalyptic number.

1216890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216890 is an abundant number, since it is smaller than the sum of its proper divisors (2028870).

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

1216890 is a wasteful number, since it uses less digits than its factorization.

1216890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4523 (or 4517 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1216890 is about 1103.1273725187. The cubic root of 1216890 is about 106.7620999215.

The spelling of 1216890 in words is "one million, two hundred sixteen thousand, eight hundred ninety".