421294399 has 2 divisors, whose sum is σ = 421294400. Its totient is φ = 421294398.

The previous prime is 421294373. The next prime is 421294409. The reversal of 421294399 is 993492124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421294399 - 2¹³ = 421286207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421294369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210647199 + 210647200.

It is an arithmetic number, because the mean of its divisors is an integer number (210647200).

Almost surely, 2^421294399 is an apocalyptic number.

421294399 is a deficient number, since it is larger than the sum of its proper divisors (1).

421294399 is an equidigital number, since it uses as much as digits as its factorization.

421294399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 421294399 is about 20525.4573396063. The cubic root of 421294399 is about 749.6557821911.

The spelling of 421294399 in words is "four hundred twenty-one million, two hundred ninety-four thousand, three hundred ninety-nine".