398020785 has 16 divisors (see below), whose sum is σ = 647628480. Its totient is φ = 208679360.

The previous prime is 398020751. The next prime is 398020841. The reversal of 398020785 is 587020893.

It is not a de Polignac number, because 398020785 - 2⁷ = 398020657 is a prime.

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, 223986 + ... + 225755.

It is an arithmetic number, because the mean of its divisors is an integer number (40476780).

Almost surely, 2^398020785 is an apocalyptic number.

It is an amenable number.

398020785 is a deficient number, since it is larger than the sum of its proper divisors (249607695).

398020785 is a wasteful number, since it uses less digits than its factorization.

398020785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449808.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 398020785 is about 19950.4582654134. The cubic root of 398020785 is about 735.5890414347.

The spelling of 398020785 in words is "three hundred ninety-eight million, twenty thousand, seven hundred eighty-five".