1988434563 has 16 divisors (see below), whose sum is σ = 2810105856. Its totient is φ = 1246354560.

The previous prime is 1988434543. The next prime is 1988434601. The reversal of 1988434563 is 3654348891.

It is not a de Polignac number, because 1988434563 - 2¹⁶ = 1988369027 is a prime.

It is a super-2 number, since 2×1988434563² = 7907744022666001938, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1988434543) 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, 30870 + ... + 70212.

It is an arithmetic number, because the mean of its divisors is an integer number (175631616).

Almost surely, 2^1988434563 is an apocalyptic number.

1988434563 is a deficient number, since it is larger than the sum of its proper divisors (821671293).

1988434563 is a wasteful number, since it uses less digits than its factorization.

1988434563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40354.

The product of its digits is 2488320, while the sum is 51.

The square root of 1988434563 is about 44591.8665565818. The cubic root of 1988434563 is about 1257.4877639262.

The spelling of 1988434563 in words is "one billion, nine hundred eighty-eight million, four hundred thirty-four thousand, five hundred sixty-three".