1988198394 has 32 divisors (see below), whose sum is σ = 4894028160. Its totient is φ = 524359872.

The previous prime is 1988198393. The next prime is 1988198447. The reversal of 1988198394 is 4938918891.

It is not an unprimeable number, because it can be changed into a prime (1988198393) 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, 1820149 + ... + 1821240.

It is an arithmetic number, because the mean of its divisors is an integer number (152938380).

Almost surely, 2^1988198394 is an apocalyptic number.

1988198394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1988198394 is an abundant number, since it is smaller than the sum of its proper divisors (2905829766).

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

1988198394 is a wasteful number, since it uses less digits than its factorization.

1988198394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641414.

The product of its digits is 4478976, while the sum is 60.

The square root of 1988198394 is about 44589.2183604961. The cubic root of 1988198394 is about 1257.4379774608.

The spelling of 1988198394 in words is "one billion, nine hundred eighty-eight million, one hundred ninety-eight thousand, three hundred ninety-four".