808747421 has 2 divisors, whose sum is σ = 808747422. Its totient is φ = 808747420.
The previous prime is 808747403. The next prime is 808747463. The reversal of 808747421 is 124747808.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 807184921 + 1562500 = 28411^2 + 1250^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-808747421 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (808747481) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404373710 + 404373711.
It is an arithmetic number, because the mean of its divisors is an integer number (404373711).
Almost surely, 2808747421 is an apocalyptic number.
It is an amenable number.
808747421 is a deficient number, since it is larger than the sum of its proper divisors (1).
808747421 is an equidigital number, since it uses as much as digits as its factorization.
808747421 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 100352, while the sum is 41.
The square root of 808747421 is about 28438.4848576713. The cubic root of 808747421 is about 931.6890033755.
The spelling of 808747421 in words is "eight hundred eight million, seven hundred forty-seven thousand, four hundred twenty-one".
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