431989381 has 8 divisors (see below), whose sum is σ = 451221120. Its totient is φ = 412795152.

The previous prime is 431989351. The next prime is 431989387. The reversal of 431989381 is 183989134.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 431989381 - 2¹⁷ = 431858309 is a prime.

It is a super-2 number, since 2×431989381² = 373229650593526322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431989387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15615 + ... + 33283.

It is an arithmetic number, because the mean of its divisors is an integer number (56402640).

Almost surely, 2^431989381 is an apocalyptic number.

It is an amenable number.

431989381 is a deficient number, since it is larger than the sum of its proper divisors (19231739).

431989381 is a wasteful number, since it uses less digits than its factorization.

431989381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18755.

The product of its digits is 186624, while the sum is 46.

The square root of 431989381 is about 20784.3542358188. The cubic root of 431989381 is about 755.9464358576.

The spelling of 431989381 in words is "four hundred thirty-one million, nine hundred eighty-nine thousand, three hundred eighty-one".