1217209460 has 48 divisors (see below), whose sum is σ = 2648010960. Its totient is φ = 469432320.

The previous prime is 1217209457. The next prime is 1217209463. The reversal of 1217209460 is 649027121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1217209457) and next prime (1217209463).

It can be written as a sum of positive squares in 8 ways, for example, as 44009956 + 1173199504 = 6634^2 + 34252^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217209463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 684092 + ... + 685868.

It is an arithmetic number, because the mean of its divisors is an integer number (55166895).

Almost surely, 2^1217209460 is an apocalyptic number.

1217209460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1217209460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324005480).

1217209460 is an abundant number, since it is smaller than the sum of its proper divisors (1430801500).

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

1217209460 is a wasteful number, since it uses less digits than its factorization.

1217209460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2996 (or 2994 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1217209460 is about 34888.5290604233. The cubic root of 1217209460 is about 1067.7144155918.

The spelling of 1217209460 in words is "one billion, two hundred seventeen million, two hundred nine thousand, four hundred sixty".