427178421 has 8 divisors (see below), whose sum is σ = 632856960. Its totient is φ = 284785596.

The previous prime is 427178417. The next prime is 427178447. The reversal of 427178421 is 124871724.

It is not a de Polignac number, because 427178421 - 2² = 427178417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427178491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7910685 + ... + 7910738.

It is an arithmetic number, because the mean of its divisors is an integer number (79107120).

Almost surely, 2^427178421 is an apocalyptic number.

It is an amenable number.

427178421 is a deficient number, since it is larger than the sum of its proper divisors (205678539).

427178421 is a wasteful number, since it uses less digits than its factorization.

427178421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15821432 (or 15821426 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 427178421 is about 20668.2950675667. The cubic root of 427178421 is about 753.1296898889.

The spelling of 427178421 in words is "four hundred twenty-seven million, one hundred seventy-eight thousand, four hundred twenty-one".