69726421 has 2 divisors, whose sum is σ = 69726422. Its totient is φ = 69726420.

The previous prime is 69726379. The next prime is 69726451. The reversal of 69726421 is 12462796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34975396 + 34751025 = 5914^2 + 5895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69726421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69726451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34863210 + 34863211.

It is an arithmetic number, because the mean of its divisors is an integer number (34863211).

Almost surely, 2^69726421 is an apocalyptic number.

It is an amenable number.

69726421 is a deficient number, since it is larger than the sum of its proper divisors (1).

69726421 is an equidigital number, since it uses as much as digits as its factorization.

69726421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 69726421 is about 8350.2347871183. The cubic root of 69726421 is about 411.5909256173.

The spelling of 69726421 in words is "sixty-nine million, seven hundred twenty-six thousand, four hundred twenty-one".