407890421 has 2 divisors, whose sum is σ = 407890422. Its totient is φ = 407890420.

The previous prime is 407890397. The next prime is 407890463. The reversal of 407890421 is 124098704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317374225 + 90516196 = 17815^2 + 9514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-407890421 is a prime.

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 (407890121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203945210 + 203945211.

It is an arithmetic number, because the mean of its divisors is an integer number (203945211).

Almost surely, 2^407890421 is an apocalyptic number.

It is an amenable number.

407890421 is a deficient number, since it is larger than the sum of its proper divisors (1).

407890421 is an equidigital number, since it uses as much as digits as its factorization.

407890421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 407890421 is about 20196.2972101324. The cubic root of 407890421 is about 741.6195482305.

The spelling of 407890421 in words is "four hundred seven million, eight hundred ninety thousand, four hundred twenty-one".