401604 has 36 divisors (see below), whose sum is σ = 1091664. Its totient is φ = 114576.

The previous prime is 401593. The next prime is 401627. The reversal of 401604 is 406104.

401604 = T₃₇ + T₃₈ + ... + T₁₃₄.

It is a super-2 number, since 2×401604² = 322571545632, which contains 22 as substring.

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247 + ... + 929.

It is an arithmetic number, because the mean of its divisors is an integer number (30324).

2⁴⁰¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (545832).

401604 is an abundant number, since it is smaller than the sum of its proper divisors (690060).

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

401604 is a wasteful number, since it uses less digits than its factorization.

401604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 695 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 401604 is about 633.7223366744. The cubic root of 401604 is about 73.7789850638.

Adding to 401604 its reverse (406104), we get a palindrome (807708).

The spelling of 401604 in words is "four hundred one thousand, six hundred four".