401971947 has 32 divisors (see below), whose sum is σ = 597897216. Its totient is φ = 238550400.

The previous prime is 401971939. The next prime is 401971963. The reversal of 401971947 is 749179104.

It is not a de Polignac number, because 401971947 - 2³ = 401971939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 401971899 and 401971908.

It is not an unprimeable number, because it can be changed into a prime (401971907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 607797 + ... + 608457.

It is an arithmetic number, because the mean of its divisors is an integer number (18684288).

Almost surely, 2^401971947 is an apocalyptic number.

401971947 is a deficient number, since it is larger than the sum of its proper divisors (195925269).

401971947 is a wasteful number, since it uses less digits than its factorization.

401971947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 401971947 is about 20049.2380653231. The cubic root of 401971947 is about 738.0151012986.

The spelling of 401971947 in words is "four hundred one million, nine hundred seventy-one thousand, nine hundred forty-seven".