402172224 has 28 divisors (see below), whose sum is σ = 1064081184. Its totient is φ = 134057344.

The previous prime is 402172223. The next prime is 402172237. The reversal of 402172224 is 422271204.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 402172194 and 402172203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402172223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1047132 + ... + 1047515.

Almost surely, 2^402172224 is an apocalyptic number.

It is an amenable number.

402172224 is an abundant number, since it is smaller than the sum of its proper divisors (661908960).

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

402172224 is a wasteful number, since it uses less digits than its factorization.

402172224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094662 (or 2094652 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 24.

The square root of 402172224 is about 20054.2320720590. The cubic root of 402172224 is about 738.1376495765.

It can be divided in two parts, 4021 and 72224, that added together give a triangular number (76245 = T₃₉₀).

The spelling of 402172224 in words is "four hundred two million, one hundred seventy-two thousand, two hundred twenty-four".