998425447 has 4 divisors (see below), whose sum is σ = 998547480. Its totient is φ = 998303416.

The previous prime is 998425429. The next prime is 998425451. The reversal of 998425447 is 744524899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744524899 = 19 ⋅39185521.

It is a cyclic number.

It is not a de Polignac number, because 998425447 - 2²⁷ = 864207719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 998425394 and 998425403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998428447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47788 + ... + 65425.

It is an arithmetic number, because the mean of its divisors is an integer number (249636870).

Almost surely, 2^998425447 is an apocalyptic number.

998425447 is a deficient number, since it is larger than the sum of its proper divisors (122033).

998425447 is a wasteful number, since it uses less digits than its factorization.

998425447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122032.

The product of its digits is 2903040, while the sum is 52.

The square root of 998425447 is about 31597.8709251114. The cubic root of 998425447 is about 999.4748732902.

The spelling of 998425447 in words is "nine hundred ninety-eight million, four hundred twenty-five thousand, four hundred forty-seven".