418007921 has 2 divisors, whose sum is σ = 418007922. Its totient is φ = 418007920.

The previous prime is 418007903. The next prime is 418007959. The reversal of 418007921 is 129700814.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 403567921 + 14440000 = 20089^2 + 3800^2 .

It is a cyclic number.

It is not a de Polignac number, because 418007921 - 2⁶ = 418007857 is a prime.

It is not a weakly prime, because it can be changed into another prime (418007521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209003960 + 209003961.

It is an arithmetic number, because the mean of its divisors is an integer number (209003961).

Almost surely, 2^418007921 is an apocalyptic number.

It is an amenable number.

418007921 is a deficient number, since it is larger than the sum of its proper divisors (1).

418007921 is an equidigital number, since it uses as much as digits as its factorization.

418007921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 418007921 is about 20445.2420137302. The cubic root of 418007921 is about 747.7013598314.

The spelling of 418007921 in words is "four hundred eighteen million, seven thousand, nine hundred twenty-one".