398255240 has 32 divisors (see below), whose sum is σ = 896762880. Its totient is φ = 159179712.

The previous prime is 398255239. The next prime is 398255261. The reversal of 398255240 is 42552893.

It is a junction number, because it is equal to n+sod(n) for n = 398255194 and 398255203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63527 + ... + 69513.

It is an arithmetic number, because the mean of its divisors is an integer number (28023840).

Almost surely, 2^398255240 is an apocalyptic number.

It is an amenable number.

398255240 is an abundant number, since it is smaller than the sum of its proper divisors (498507640).

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

398255240 is a wasteful number, since it uses less digits than its factorization.

398255240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7661 (or 7657 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 398255240 is about 19956.3333305495. Note that the first 5 decimals coincide. The cubic root of 398255240 is about 735.7334465204.

The spelling of 398255240 in words is "three hundred ninety-eight million, two hundred fifty-five thousand, two hundred forty".