991425038 has 8 divisors (see below), whose sum is σ = 1488000888. Its totient is φ = 495424744.

The previous prime is 991425007. The next prime is 991425047. The reversal of 991425038 is 830524199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×991425038³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 991424986 and 991425004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139556 + ... + 146487.

It is an arithmetic number, because the mean of its divisors is an integer number (186000111).

Almost surely, 2^991425038 is an apocalyptic number.

991425038 is a deficient number, since it is larger than the sum of its proper divisors (496575850).

991425038 is a wasteful number, since it uses less digits than its factorization.

991425038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287778.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 991425038 is about 31486.9026422098. The cubic root of 991425038 is about 997.1334701916.

The spelling of 991425038 in words is "nine hundred ninety-one million, four hundred twenty-five thousand, thirty-eight".