432978991 has 4 divisors (see below), whose sum is σ = 439441432. Its totient is φ = 426516552.

The previous prime is 432978989. The next prime is 432979003. The reversal of 432978991 is 199879234.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 432978991 - 2¹ = 432978989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (432978391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3231120 + ... + 3231253.

It is an arithmetic number, because the mean of its divisors is an integer number (109860358).

Almost surely, 2^432978991 is an apocalyptic number.

432978991 is a deficient number, since it is larger than the sum of its proper divisors (6462441).

432978991 is an equidigital number, since it uses as much as digits as its factorization.

432978991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462440.

The product of its digits is 979776, while the sum is 52.

The square root of 432978991 is about 20808.1472265072. The cubic root of 432978991 is about 756.5232414174.

The spelling of 432978991 in words is "four hundred thirty-two million, nine hundred seventy-eight thousand, nine hundred ninety-one".