998962940638 has 8 divisors (see below), whose sum is σ = 1613709365688. Its totient is φ = 461059818744.

The previous prime is 998962940627. The next prime is 998962940639. The reversal of 998962940638 is 836049269899.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998962940639) 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, 19210825756 + ... + 19210825807.

It is an arithmetic number, because the mean of its divisors is an integer number (201713670711).

Almost surely, 2^998962940638 is an apocalyptic number.

998962940638 is a deficient number, since it is larger than the sum of its proper divisors (614746425050).

998962940638 is a wasteful number, since it uses less digits than its factorization.

998962940638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38421651578.

The product of its (nonzero) digits is 362797056, while the sum is 73.

The spelling of 998962940638 in words is "nine hundred ninety-eight billion, nine hundred sixty-two million, nine hundred forty thousand, six hundred thirty-eight".