421415993 has 2 divisors, whose sum is σ = 421415994. Its totient is φ = 421415992.

The previous prime is 421415963. The next prime is 421416019. The reversal of 421415993 is 399514124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238300969 + 183115024 = 15437^2 + 13532^2 .

It is a cyclic number.

It is not a de Polignac number, because 421415993 - 2¹⁰ = 421414969 is a prime.

It is not a weakly prime, because it can be changed into another prime (421415963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210707996 + 210707997.

It is an arithmetic number, because the mean of its divisors is an integer number (210707997).

Almost surely, 2^421415993 is an apocalyptic number.

It is an amenable number.

421415993 is a deficient number, since it is larger than the sum of its proper divisors (1).

421415993 is an equidigital number, since it uses as much as digits as its factorization.

421415993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 421415993 is about 20528.4191549179. The cubic root of 421415993 is about 749.7278971438.

The spelling of 421415993 in words is "four hundred twenty-one million, four hundred fifteen thousand, nine hundred ninety-three".