426378021 has 8 divisors (see below), whose sum is σ = 569173920. Its totient is φ = 283917072.

The previous prime is 426378013. The next prime is 426378083. The reversal of 426378021 is 120873624.

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

It is not a de Polignac number, because 426378021 - 2³ = 426378013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426378011) 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, 80751 + ... + 85868.

It is an arithmetic number, because the mean of its divisors is an integer number (71146740).

Almost surely, 2^426378021 is an apocalyptic number.

It is an amenable number.

426378021 is a deficient number, since it is larger than the sum of its proper divisors (142795899).

426378021 is a wasteful number, since it uses less digits than its factorization.

426378021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167475.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 426378021 is about 20648.9229985489. The cubic root of 426378021 is about 752.6590185749.

The spelling of 426378021 in words is "four hundred twenty-six million, three hundred seventy-eight thousand, twenty-one".