1217657052 has 36 divisors (see below), whose sum is σ = 3101474376. Its totient is φ = 402785760.

The previous prime is 1217657041. The next prime is 1217657057. The reversal of 1217657052 is 2507567121.

1217657052 is a `hidden beast` number, since 12 + 1 + 76 + 570 + 5 + 2 = 666.

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 junction number, because it is equal to n+sod(n) for n = 1217656998 and 1217657016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217657057) 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, 124383 + ... + 133814.

It is an arithmetic number, because the mean of its divisors is an integer number (86152066).

Almost surely, 2^1217657052 is an apocalyptic number.

1217657052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1217657052 is an abundant number, since it is smaller than the sum of its proper divisors (1883817324).

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

1217657052 is a wasteful number, since it uses less digits than its factorization.

1217657052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258338 (or 258333 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 1217657052 is about 34894.9430720269. The cubic root of 1217657052 is about 1067.8452727917.

The spelling of 1217657052 in words is "one billion, two hundred seventeen million, six hundred fifty-seven thousand, fifty-two".