423991909491 has 8 divisors (see below), whose sum is σ = 566433201360. Its totient is φ = 282105945312.

The previous prime is 423991909463. The next prime is 423991909499. The reversal of 423991909491 is 194909199324.

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

It is not a de Polignac number, because 423991909491 - 2¹⁰ = 423991908467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (423991909499) 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, 138830140 + ... + 138833193.

It is an arithmetic number, because the mean of its divisors is an integer number (70804150170).

Almost surely, 2^423991909491 is an apocalyptic number.

423991909491 is a deficient number, since it is larger than the sum of its proper divisors (142441291869).

423991909491 is a wasteful number, since it uses less digits than its factorization.

423991909491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277663845.

The product of its (nonzero) digits is 5668704, while the sum is 60.

The spelling of 423991909491 in words is "four hundred twenty-three billion, nine hundred ninety-one million, nine hundred nine thousand, four hundred ninety-one".