401521402 has 8 divisors (see below), whose sum is σ = 637710516. Its totient is φ = 188951232.

The previous prime is 401521397. The next prime is 401521403. The reversal of 401521402 is 204125104.

It can be written as a sum of positive squares in 2 ways, for example, as 381459961 + 20061441 = 19531^2 + 4479^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×401521402² = 322438872528091208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401521402.

It is not an unprimeable number, because it can be changed into a prime (401521403) 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, 5904693 + ... + 5904760.

Almost surely, 2^401521402 is an apocalyptic number.

401521402 is a deficient number, since it is larger than the sum of its proper divisors (236189114).

401521402 is a wasteful number, since it uses less digits than its factorization.

401521402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11809472.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 401521402 is about 20037.9989519912. The cubic root of 401521402 is about 737.7392666928.

Adding to 401521402 its reverse (204125104), we get a palindrome (605646506).

The spelling of 401521402 in words is "four hundred one million, five hundred twenty-one thousand, four hundred two".