1212586164 has 36 divisors (see below), whose sum is σ = 3170845860. Its totient is φ = 390257280.

The previous prime is 1212586159. The next prime is 1212586169. The reversal of 1212586164 is 4616852121.

It is a happy number.

1212586164 is a `hidden beast` number, since 1 + 2 + 12 + 586 + 1 + 64 = 666.

It is an interprime number because it is at equal distance from previous prime (1212586159) and next prime (1212586169).

It can be written as a sum of positive squares in 2 ways, for example, as 862596900 + 349989264 = 29370^2 + 18708^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212586169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 579697 + ... + 581784.

Almost surely, 2^1212586164 is an apocalyptic number.

It is an amenable number.

1212586164 is an abundant number, since it is smaller than the sum of its proper divisors (1958259696).

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

1212586164 is a wasteful number, since it uses less digits than its factorization.

1212586164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161520 (or 1161515 counting only the distinct ones).

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

The square root of 1212586164 is about 34822.2079139161. The cubic root of 1212586164 is about 1066.3608761903.

It can be divided in two parts, 12125 and 86164, that added together give a palindrome (98289).

The spelling of 1212586164 in words is "one billion, two hundred twelve million, five hundred eighty-six thousand, one hundred sixty-four".