207421998 has 96 divisors (see below), whose sum is σ = 522422784. Its totient is φ = 54528768.

The previous prime is 207421979. The next prime is 207421999. The reversal of 207421998 is 899124702.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207421999) 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, 234465 + ... + 235347.

It is an arithmetic number, because the mean of its divisors is an integer number (5441904).

Almost surely, 2^207421998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 207421998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261211392).

207421998 is an abundant number, since it is smaller than the sum of its proper divisors (315000786).

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

207421998 is a wasteful number, since it uses less digits than its factorization.

207421998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 207421998 is about 14402.1525474493. The cubic root of 207421998 is about 591.9498812422.

The spelling of 207421998 in words is "two hundred seven million, four hundred twenty-one thousand, nine hundred ninety-eight".