401521306 has 4 divisors (see below), whose sum is σ = 602281962. Its totient is φ = 200760652.

The previous prime is 401521301. The next prime is 401521313. The reversal of 401521306 is 603125104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 348158281 + 53363025 = 18659^2 + 7305^2 .

It is a super-2 number, since 2×401521306² = 322438718343891272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401521301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100380325 + ... + 100380328.

Almost surely, 2^401521306 is an apocalyptic number.

401521306 is a deficient number, since it is larger than the sum of its proper divisors (200760656).

401521306 is a wasteful number, since it uses less digits than its factorization.

401521306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200760655.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 401521306 is about 20037.9965565423. The cubic root of 401521306 is about 737.7392078973.

The spelling of 401521306 in words is "four hundred one million, five hundred twenty-one thousand, three hundred six".