478297021 has 8 divisors (see below), whose sum is σ = 494303544. Its totient is φ = 462497280.

The previous prime is 478297019. The next prime is 478297081. The reversal of 478297021 is 120792874.

It can be written as a sum of positive squares in 4 ways, for example, as 8491396 + 469805625 = 2914^2 + 21675^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 478297021 - 2¹ = 478297019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478297081) 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, 46986 + ... + 56251.

It is an arithmetic number, because the mean of its divisors is an integer number (61787943).

Almost surely, 2^478297021 is an apocalyptic number.

478297021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

478297021 is a deficient number, since it is larger than the sum of its proper divisors (16006523).

478297021 is a wasteful number, since it uses less digits than its factorization.

478297021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103391.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 478297021 is about 21870.0027663464. The cubic root of 478297021 is about 782.0464674782.

The spelling of 478297021 in words is "four hundred seventy-eight million, two hundred ninety-seven thousand, twenty-one".