401601604 has 12 divisors (see below), whose sum is σ = 707280364. Its totient is φ = 199521504.

The previous prime is 401601593. The next prime is 401601611. The reversal of 401601604 is 406106104.

It can be written as a sum of positive squares in 2 ways, for example, as 117679104 + 283922500 = 10848^2 + 16850^2 .

It is a super-2 number, since 2×401601604² = 322567696670745632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319119 + ... + 320374.

Almost surely, 2^401601604 is an apocalyptic number.

It is an amenable number.

401601604 is a deficient number, since it is larger than the sum of its proper divisors (305678760).

401601604 is a wasteful number, since it uses less digits than its factorization.

401601604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639654 (or 639652 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 401601604 is about 20040.0000998004. Note that the first 4 decimals coincide. The cubic root of 401601604 is about 737.7883833985.

Adding to 401601604 its reverse (406106104), we get a palindrome (807707708).

The spelling of 401601604 in words is "four hundred one million, six hundred one thousand, six hundred four".