407904421 has 2 divisors, whose sum is σ = 407904422. Its totient is φ = 407904420.

The previous prime is 407904397. The next prime is 407904439. The reversal of 407904421 is 124409704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310112100 + 97792321 = 17610^2 + 9889^2 .

It is a cyclic number.

It is not a de Polignac number, because 407904421 - 2¹⁹ = 407380133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (407904451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203952210 + 203952211.

It is an arithmetic number, because the mean of its divisors is an integer number (203952211).

Almost surely, 2^407904421 is an apocalyptic number.

It is an amenable number.

407904421 is a deficient number, since it is larger than the sum of its proper divisors (1).

407904421 is an equidigital number, since it uses as much as digits as its factorization.

407904421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 407904421 is about 20196.6438053455. The cubic root of 407904421 is about 741.6280329888.

The spelling of 407904421 in words is "four hundred seven million, nine hundred four thousand, four hundred twenty-one".