402220172 has 24 divisors (see below), whose sum is σ = 719845056. Its totient is φ = 196562048.

The previous prime is 402220171. The next prime is 402220207. The reversal of 402220172 is 271022204.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (402220171) 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, 268658 + ... + 270150.

It is an arithmetic number, because the mean of its divisors is an integer number (29993544).

Almost surely, 2^402220172 is an apocalyptic number.

It is an amenable number.

402220172 is a deficient number, since it is larger than the sum of its proper divisors (317624884).

402220172 is a wasteful number, since it uses less digits than its factorization.

402220172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977 (or 2975 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 402220172 is about 20055.4274948204. The cubic root of 402220172 is about 738.1669826296.

Adding to 402220172 its reverse (271022204), we get a palindrome (673242376).

The spelling of 402220172 in words is "four hundred two million, two hundred twenty thousand, one hundred seventy-two".