401506278 has 32 divisors (see below), whose sum is σ = 825541632. Its totient is φ = 130132800.

The previous prime is 401506253. The next prime is 401506297. The reversal of 401506278 is 872605104.

It is a super-4 number, since 4×401506278⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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, 24643 + ... + 37553.

It is an arithmetic number, because the mean of its divisors is an integer number (25798176).

Almost surely, 2^401506278 is an apocalyptic number.

401506278 is an abundant number, since it is smaller than the sum of its proper divisors (424035354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401506278 is a wasteful number, since it uses less digits than its factorization.

401506278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13060.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 401506278 is about 20037.6215654453. The cubic root of 401506278 is about 737.7300038335.

The spelling of 401506278 in words is "four hundred one million, five hundred six thousand, two hundred seventy-eight".