401557 has 16 divisors (see below), whose sum is σ = 483840. Its totient is φ = 329472.

The previous prime is 401551. The next prime is 401567. The reversal of 401557 is 755104.

401557 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 401557 - 2¹⁵ = 368789 is a prime.

It is a super-2 number, since 2×401557² = 322496048498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5044 + ... + 5122.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2⁴⁰¹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

401557 is a deficient number, since it is larger than the sum of its proper divisors (82283).

401557 is a wasteful number, since it uses less digits than its factorization.

401557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 401557 is about 633.6852531028. The cubic root of 401557 is about 73.7761068159.

The spelling of 401557 in words is "four hundred one thousand, five hundred fifty-seven".