398781655 has 16 divisors (see below), whose sum is σ = 489281760. Its totient is φ = 311933952.

The previous prime is 398781599. The next prime is 398781661. The reversal of 398781655 is 556187893.

It is a cyclic number.

It is not a de Polignac number, because 398781655 - 2¹¹ = 398779607 is a prime.

It is a congruent number.

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, 41551 + ... + 50239.

It is an arithmetic number, because the mean of its divisors is an integer number (30580110).

Almost surely, 2^398781655 is an apocalyptic number.

398781655 is a deficient number, since it is larger than the sum of its proper divisors (90500105).

398781655 is a wasteful number, since it uses less digits than its factorization.

398781655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8898.

The product of its digits is 1814400, while the sum is 52.

The square root of 398781655 is about 19969.5181464151. The cubic root of 398781655 is about 736.0574687079.

The spelling of 398781655 in words is "three hundred ninety-eight million, seven hundred eighty-one thousand, six hundred fifty-five".