423978507 has 12 divisors (see below), whose sum is σ = 618478224. Its totient is φ = 279853200.

The previous prime is 423978469. The next prime is 423978517. The reversal of 423978507 is 705879324.

423978507 is a `hidden beast` number, since 42 + 39 + 78 + 507 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-423978507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (423978517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232303 + ... + 234120.

It is an arithmetic number, because the mean of its divisors is an integer number (51539852).

Almost surely, 2^423978507 is an apocalyptic number.

423978507 is a deficient number, since it is larger than the sum of its proper divisors (194499717).

423978507 is a wasteful number, since it uses less digits than its factorization.

423978507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466530 (or 466527 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 423978507 is about 20590.7383791840. The cubic root of 423978507 is about 751.2444566282.

The spelling of 423978507 in words is "four hundred twenty-three million, nine hundred seventy-eight thousand, five hundred seven".