421578157 has 24 divisors (see below), whose sum is σ = 570338048. Its totient is φ = 303225120.

The previous prime is 421578119. The next prime is 421578161. The reversal of 421578157 is 751875124.

It is not a de Polignac number, because 421578157 - 2¹¹ = 421576109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421578757) 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 23 ways as a sum of consecutive naturals, for example, 8133 + ... + 30154.

Almost surely, 2^421578157 is an apocalyptic number.

It is an amenable number.

421578157 is a deficient number, since it is larger than the sum of its proper divisors (148759891).

421578157 is a wasteful number, since it uses less digits than its factorization.

421578157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38329 (or 38318 counting only the distinct ones).

The product of its digits is 78400, while the sum is 40.

The square root of 421578157 is about 20532.3685189995. The cubic root of 421578157 is about 749.8240517632.

The spelling of 421578157 in words is "four hundred twenty-one million, five hundred seventy-eight thousand, one hundred fifty-seven".