478027421 has 2 divisors, whose sum is σ = 478027422. Its totient is φ = 478027420.

The previous prime is 478027393. The next prime is 478027447. The reversal of 478027421 is 124720874.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319015321 + 159012100 = 17861^2 + 12610^2 .

It is a cyclic number.

It is not a de Polignac number, because 478027421 - 2⁶ = 478027357 is a prime.

It is a super-2 number, since 2×478027421² = 457020430455822482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478027321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239013710 + 239013711.

It is an arithmetic number, because the mean of its divisors is an integer number (239013711).

Almost surely, 2^478027421 is an apocalyptic number.

It is an amenable number.

478027421 is a deficient number, since it is larger than the sum of its proper divisors (1).

478027421 is an equidigital number, since it uses as much as digits as its factorization.

478027421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 35.

The square root of 478027421 is about 21863.8382037555. The cubic root of 478027421 is about 781.8995020674.

The spelling of 478027421 in words is "four hundred seventy-eight million, twenty-seven thousand, four hundred twenty-one".