401549 has 4 divisors (see below), whose sum is σ = 403260. Its totient is φ = 399840.

The previous prime is 401539. The next prime is 401551. The reversal of 401549 is 945104.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 133225 + 268324 = 365^2 + 518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401549 is a prime.

It is a super-2 number, since 2×401549² = 322483198802, 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 (401519) 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 3 ways as a sum of consecutive naturals, for example, 434 + ... + 995.

It is an arithmetic number, because the mean of its divisors is an integer number (100815).

2⁴⁰¹⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

401549 is a deficient number, since it is larger than the sum of its proper divisors (1711).

401549 is a wasteful number, since it uses less digits than its factorization.

401549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 401549 is about 633.6789407894. The cubic root of 401549 is about 73.7756168790.

The spelling of 401549 in words is "four hundred one thousand, five hundred forty-nine".