398178440 has 64 divisors (see below), whose sum is σ = 1028808000. Its totient is φ = 137168640.

The previous prime is 398178419. The next prime is 398178457. The reversal of 398178440 is 44871893.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 398178391 and 398178400.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15455 + ... + 32174.

It is an arithmetic number, because the mean of its divisors is an integer number (16075125).

Almost surely, 2^398178440 is an apocalyptic number.

It is an amenable number.

398178440 is an abundant number, since it is smaller than the sum of its proper divisors (630629560).

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

398178440 is a wasteful number, since it uses less digits than its factorization.

398178440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47670 (or 47666 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 398178440 is about 19954.4090366014. The cubic root of 398178440 is about 735.6861502511.

The spelling of 398178440 in words is "three hundred ninety-eight million, one hundred seventy-eight thousand, four hundred forty".