1217954920 has 64 divisors (see below), whose sum is σ = 3372808320. Its totient is φ = 385461504.

The previous prime is 1217954917. The next prime is 1217954921. The reversal of 1217954920 is 294597121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1217954921) 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, 163662 + ... + 170941.

It is an arithmetic number, because the mean of its divisors is an integer number (52700130).

Almost surely, 2^1217954920 is an apocalyptic number.

1217954920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217954920 is an abundant number, since it is smaller than the sum of its proper divisors (2154853400).

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

1217954920 is a wasteful number, since it uses less digits than its factorization.

1217954920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334634 (or 334630 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 1217954920 is about 34899.2108793308. The cubic root of 1217954920 is about 1067.9323391794.

The spelling of 1217954920 in words is "one billion, two hundred seventeen million, nine hundred fifty-four thousand, nine hundred twenty".