1212985440 has 72 divisors (see below), whose sum is σ = 4139317728. Its totient is φ = 323462400.

The previous prime is 1212985429. The next prime is 1212985481. The reversal of 1212985440 is 445892121.

1212985440 is a `hidden beast` number, since 1 + 21 + 2 + 98 + 544 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1212985395 and 1212985404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 419736 + ... + 422615.

It is an arithmetic number, because the mean of its divisors is an integer number (57490524).

Almost surely, 2^1212985440 is an apocalyptic number.

1212985440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212985440 is an abundant number, since it is smaller than the sum of its proper divisors (2926332288).

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

1212985440 is a wasteful number, since it uses less digits than its factorization.

1212985440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842372 (or 842361 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1212985440 is about 34827.9405075867. The cubic root of 1212985440 is about 1066.4779058343.

The spelling of 1212985440 in words is "one billion, two hundred twelve million, nine hundred eighty-five thousand, four hundred forty".