498405621 has 32 divisors (see below), whose sum is σ = 772208640. Its totient is φ = 280062144.

The previous prime is 498405617. The next prime is 498405641. The reversal of 498405621 is 126504894.

It is not a de Polignac number, because 498405621 - 2² = 498405617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 498405621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (498405641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 468336 + ... + 469398.

It is an arithmetic number, because the mean of its divisors is an integer number (24131520).

Almost surely, 2^498405621 is an apocalyptic number.

It is an amenable number.

498405621 is a deficient number, since it is larger than the sum of its proper divisors (273803019).

498405621 is a wasteful number, since it uses less digits than its factorization.

498405621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 498405621 is about 22324.9999104143. Note that the first 4 decimals coincide. The cubic root of 498405621 is about 792.8559880373.

The spelling of 498405621 in words is "four hundred ninety-eight million, four hundred five thousand, six hundred twenty-one".