990724447 has 2 divisors, whose sum is σ = 990724448. Its totient is φ = 990724446.

The previous prime is 990724411. The next prime is 990724459. The reversal of 990724447 is 744427099.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990724447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 990724397 and 990724406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990721447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495362223 + 495362224.

It is an arithmetic number, because the mean of its divisors is an integer number (495362224).

Almost surely, 2^990724447 is an apocalyptic number.

990724447 is a deficient number, since it is larger than the sum of its proper divisors (1).

990724447 is an equidigital number, since it uses as much as digits as its factorization.

990724447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 990724447 is about 31475.7755583560. The cubic root of 990724447 is about 996.8985398896.

The spelling of 990724447 in words is "nine hundred ninety million, seven hundred twenty-four thousand, four hundred forty-seven".