1212910840 has 16 divisors (see below), whose sum is σ = 2729049480. Its totient is φ = 485164320.

The previous prime is 1212910807. The next prime is 1212910871. The reversal of 1212910840 is 480192121.

It is a junction number, because it is equal to n+sod(n) for n = 1212910799 and 1212910808.

It is a congruent number.

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, 15161346 + ... + 15161425.

Almost surely, 2^1212910840 is an apocalyptic number.

1212910840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212910840 is an abundant number, since it is smaller than the sum of its proper divisors (1516138640).

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

1212910840 is a wasteful number, since it uses less digits than its factorization.

1212910840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30322782 (or 30322778 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1212910840 is about 34826.8695119157. The cubic root of 1212910840 is about 1066.4560421801.

The spelling of 1212910840 in words is "one billion, two hundred twelve million, nine hundred ten thousand, eight hundred forty".