894403721 has 2 divisors, whose sum is σ = 894403722. Its totient is φ = 894403720.

The previous prime is 894403687. The next prime is 894403733. The reversal of 894403721 is 127304498.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 893113225 + 1290496 = 29885^2 + 1136^2 .

It is a cyclic number.

It is not a de Polignac number, because 894403721 - 2²⁶ = 827294857 is a prime.

It is a super-2 number, since 2×894403721² = 1599916032277291682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (894403021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 447201860 + 447201861.

It is an arithmetic number, because the mean of its divisors is an integer number (447201861).

Almost surely, 2^894403721 is an apocalyptic number.

It is an amenable number.

894403721 is a deficient number, since it is larger than the sum of its proper divisors (1).

894403721 is an equidigital number, since it uses as much as digits as its factorization.

894403721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 894403721 is about 29906.5832384778. The cubic root of 894403721 is about 963.4840564950.

The spelling of 894403721 in words is "eight hundred ninety-four million, four hundred three thousand, seven hundred twenty-one".