1398917220 has 48 divisors (see below), whose sum is σ = 3938880960. Its totient is φ = 370957696.

The previous prime is 1398917173. The next prime is 1398917249. The reversal of 1398917220 is 227198931.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54387 + ... + 75866.

It is an arithmetic number, because the mean of its divisors is an integer number (82060020).

Almost surely, 2^1398917220 is an apocalyptic number.

1398917220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1398917220 is an abundant number, since it is smaller than the sum of its proper divisors (2539963740).

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

1398917220 is a wasteful number, since it uses less digits than its factorization.

1398917220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130444 (or 130442 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1398917220 is about 37402.1018125987. The cubic root of 1398917220 is about 1118.4004643613.

The spelling of 1398917220 in words is "one billion, three hundred ninety-eight million, nine hundred seventeen thousand, two hundred twenty".