398042655 has 8 divisors (see below), whose sum is σ = 636868272. Its totient is φ = 212289408.

The previous prime is 398042599. The next prime is 398042657. The reversal of 398042655 is 556240893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398042655 - 2⁶ = 398042591 is a prime.

It is a super-3 number, since 3×398042655³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398042657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13268074 + ... + 13268103.

It is an arithmetic number, because the mean of its divisors is an integer number (79608534).

Almost surely, 2^398042655 is an apocalyptic number.

398042655 is a deficient number, since it is larger than the sum of its proper divisors (238825617).

398042655 is a wasteful number, since it uses less digits than its factorization.

398042655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26536185.

The product of its (nonzero) digits is 259200, while the sum is 42.

The square root of 398042655 is about 19951.0063655947. The cubic root of 398042655 is about 735.6025139620.

The spelling of 398042655 in words is "three hundred ninety-eight million, forty-two thousand, six hundred fifty-five".