1217490420 has 48 divisors (see below), whose sum is σ = 3435018048. Its totient is φ = 322183680.

The previous prime is 1217490371. The next prime is 1217490427. The reversal of 1217490420 is 240947121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217490427) 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, 69589 + ... + 85308.

It is an arithmetic number, because the mean of its divisors is an integer number (71562876).

Almost surely, 2^1217490420 is an apocalyptic number.

1217490420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217490420 is an abundant number, since it is smaller than the sum of its proper divisors (2217527628).

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

1217490420 is a wasteful number, since it uses less digits than its factorization.

1217490420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155040 (or 155038 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1217490420 is about 34892.5553664388. Note that the first 3 decimals coincide. The cubic root of 1217490420 is about 1067.7965603045.

The spelling of 1217490420 in words is "one billion, two hundred seventeen million, four hundred ninety thousand, four hundred twenty".