1212349890 has 32 divisors (see below), whose sum is σ = 2913393600. Its totient is φ = 322876224.

The previous prime is 1212349889. The next prime is 1212349937. The reversal of 1212349890 is 989432121.

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

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, 2065 + ... + 49284.

It is an arithmetic number, because the mean of its divisors is an integer number (91043550).

Almost surely, 2^1212349890 is an apocalyptic number.

1212349890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212349890 is an abundant number, since it is smaller than the sum of its proper divisors (1701043710).

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

1212349890 is a wasteful number, since it uses less digits than its factorization.

1212349890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52146.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 1212349890 is about 34818.8151722600. The cubic root of 1212349890 is about 1066.2916110875.

The spelling of 1212349890 in words is "one billion, two hundred twelve million, three hundred forty-nine thousand, eight hundred ninety".