1238404398 has 64 divisors (see below), whose sum is σ = 3099437568. Its totient is φ = 320469120.

The previous prime is 1238404381. The next prime is 1238404421. The reversal of 1238404398 is 8934048321.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123136 + ... + 132812.

It is an arithmetic number, because the mean of its divisors is an integer number (48428712).

Almost surely, 2^1238404398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1238404398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1549718784).

1238404398 is an abundant number, since it is smaller than the sum of its proper divisors (1861033170).

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

1238404398 is a wasteful number, since it uses less digits than its factorization.

1238404398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9977.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 1238404398 is about 35190.9704043523. The cubic root of 1238404398 is about 1073.8760628774.

The spelling of 1238404398 in words is "one billion, two hundred thirty-eight million, four hundred four thousand, three hundred ninety-eight".