402220401 has 16 divisors (see below), whose sum is σ = 605223360. Its totient is φ = 235363520.

The previous prime is 402220387. The next prime is 402220439. The reversal of 402220401 is 104022204.

It is a cyclic number.

It is not a de Polignac number, because 402220401 - 2¹⁴ = 402204017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402220471) 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, 209190 + ... + 211103.

It is an arithmetic number, because the mean of its divisors is an integer number (37826460).

Almost surely, 2^402220401 is an apocalyptic number.

It is an amenable number.

402220401 is a deficient number, since it is larger than the sum of its proper divisors (203002959).

402220401 is a wasteful number, since it uses less digits than its factorization.

402220401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420336.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 402220401 is about 20055.4332039974. The cubic root of 402220401 is about 738.1671227189.

Adding to 402220401 its reverse (104022204), we get a palindrome (506242605).

The spelling of 402220401 in words is "four hundred two million, two hundred twenty thousand, four hundred one".