398448449490 has 384 divisors, whose sum is σ = 1290426826752. Its totient is φ = 77816471040.

The previous prime is 398448449423. The next prime is 398448449527. The reversal of 398448449490 is 94944844893.

It is a super-2 number, since 2×398448449490² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 13610809 + ... + 13640051.

It is an arithmetic number, because the mean of its divisors is an integer number (3360486528).

Almost surely, 2^398448449490 is an apocalyptic number.

398448449490 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 398448449490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645213413376).

398448449490 is an abundant number, since it is smaller than the sum of its proper divisors (891978377262).

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

398448449490 is a wasteful number, since it uses less digits than its factorization.

398448449490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29334 (or 29327 counting only the distinct ones).

The product of its (nonzero) digits is 143327232, while the sum is 66.

The spelling of 398448449490 in words is "three hundred ninety-eight billion, four hundred forty-eight million, four hundred forty-nine thousand, four hundred ninety".