431988985 has 16 divisors (see below), whose sum is σ = 536140800. Its totient is φ = 333942336.

The previous prime is 431988971. The next prime is 431989031. The reversal of 431988985 is 589889134.

It is a cyclic number.

It is not a de Polignac number, because 431988985 - 2⁷ = 431988857 is a prime.

It is a super-2 number, since 2×431988985² = 373228966322660450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6931 + ... + 30199.

It is an arithmetic number, because the mean of its divisors is an integer number (33508800).

Almost surely, 2^431988985 is an apocalyptic number.

It is an amenable number.

431988985 is a deficient number, since it is larger than the sum of its proper divisors (104151815).

431988985 is a wasteful number, since it uses less digits than its factorization.

431988985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23400.

The product of its digits is 2488320, while the sum is 55.

The square root of 431988985 is about 20784.3447094201. The cubic root of 431988985 is about 755.9462048683.

The spelling of 431988985 in words is "four hundred thirty-one million, nine hundred eighty-eight thousand, nine hundred eighty-five".