1217742008 has 32 divisors (see below), whose sum is σ = 2614085760. Its totient is φ = 520961760.

The previous prime is 1217742007. The next prime is 1217742017. The reversal of 1217742008 is 8002477121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217742007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12935 + ... + 51017.

It is an arithmetic number, because the mean of its divisors is an integer number (81690180).

Almost surely, 2^1217742008 is an apocalyptic number.

It is an amenable number.

1217742008 is an abundant number, since it is smaller than the sum of its proper divisors (1396343752).

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

1217742008 is a wasteful number, since it uses less digits than its factorization.

1217742008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38667 (or 38663 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 1217742008 is about 34896.1603618507. The cubic root of 1217742008 is about 1067.8701067555.

The spelling of 1217742008 in words is "one billion, two hundred seventeen million, seven hundred forty-two thousand, eight".