398765042 has 16 divisors (see below), whose sum is σ = 644922432. Its totient is φ = 183827280.

The previous prime is 398765041. The next prime is 398765077. The reversal of 398765042 is 240567893.

It is a junction number, because it is equal to n+sod(n) for n = 398764984 and 398765002.

It is not an unprimeable number, because it can be changed into a prime (398765041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14417 + ... + 31707.

It is an arithmetic number, because the mean of its divisors is an integer number (40307652).

Almost surely, 2^398765042 is an apocalyptic number.

398765042 is a deficient number, since it is larger than the sum of its proper divisors (246157390).

398765042 is a wasteful number, since it uses less digits than its factorization.

398765042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18193.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 398765042 is about 19969.1021831228. The cubic root of 398765042 is about 736.0472473312.

The spelling of 398765042 in words is "three hundred ninety-eight million, seven hundred sixty-five thousand, forty-two".