401728155 has 16 divisors (see below), whose sum is σ = 664930080. Its totient is φ = 206866688.

The previous prime is 401728147. The next prime is 401728157. The reversal of 401728155 is 551827104.

It is a cyclic number.

It is not a de Polignac number, because 401728155 - 2³ = 401728147 is a prime.

It is a super-2 number, since 2×401728155² = 322771021039408050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401728157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461322 + ... + 462191.

It is an arithmetic number, because the mean of its divisors is an integer number (41558130).

Almost surely, 2^401728155 is an apocalyptic number.

401728155 is a deficient number, since it is larger than the sum of its proper divisors (263201925).

401728155 is a wasteful number, since it uses less digits than its factorization.

401728155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923550.

The product of its (nonzero) digits is 11200, while the sum is 33.

The square root of 401728155 is about 20043.1573111623. The cubic root of 401728155 is about 737.8658715121.

The spelling of 401728155 in words is "four hundred one million, seven hundred twenty-eight thousand, one hundred fifty-five".