401506605 has 16 divisors (see below), whose sum is σ = 713789760. Its totient is φ = 214136784.

The previous prime is 401506601. The next prime is 401506621. The reversal of 401506605 is 506605104.

It is a happy number.

401506605 is a `hidden beast` number, since 4 + 0 + 1 + 50 + 6 + 605 = 666.

It is not a de Polignac number, because 401506605 - 2² = 401506601 is a prime.

It is a super-2 number, since 2×401506605² = 322415107717252050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401506601) 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, 1486927 + ... + 1487196.

It is an arithmetic number, because the mean of its divisors is an integer number (44611860).

Almost surely, 2^401506605 is an apocalyptic number.

401506605 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

401506605 is a deficient number, since it is larger than the sum of its proper divisors (312283155).

401506605 is a wasteful number, since it uses less digits than its factorization.

401506605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2974137 (or 2974131 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 401506605 is about 20037.6297250947. The cubic root of 401506605 is about 737.7302041107.

The spelling of 401506605 in words is "four hundred one million, five hundred six thousand, six hundred five".