1213690 has 8 divisors (see below), whose sum is σ = 2184660. Its totient is φ = 485472.

The previous prime is 1213673. The next prime is 1213721. The reversal of 1213690 is 963121.

It can be written as a sum of positive squares in 2 ways, for example, as 1190281 + 23409 = 1091^2 + 153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1213690² = 2946086832200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60675 + ... + 60694.

2^1213690 is an apocalyptic number.

1213690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213690 is a deficient number, since it is larger than the sum of its proper divisors (970970).

1213690 is a wasteful number, since it uses less digits than its factorization.

1213690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121376.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1213690 is about 1101.6759959262. The cubic root of 1213690 is about 106.6684353005.

The spelling of 1213690 in words is "one million, two hundred thirteen thousand, six hundred ninety".