398690021100 has 144 divisors (see below), whose sum is σ = 1319271339008. Its totient is φ = 91064424960.

The previous prime is 398690021029. The next prime is 398690021101. The reversal of 398690021100 is 1120096893.

It is not an unprimeable number, because it can be changed into a prime (398690021101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2921592 + ... + 3055008.

Almost surely, 2^398690021100 is an apocalyptic number.

398690021100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398690021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659635669504).

398690021100 is an abundant number, since it is smaller than the sum of its proper divisors (920581317908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398690021100 is a wasteful number, since it uses less digits than its factorization.

398690021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134864 (or 134857 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The spelling of 398690021100 in words is "three hundred ninety-eight billion, six hundred ninety million, twenty-one thousand, one hundred".