401389 has 4 divisors (see below), whose sum is σ = 415260. Its totient is φ = 387520.

The previous prime is 401381. The next prime is 401393. The reversal of 401389 is 983104.

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 168100 + 233289 = 410^2 + 483^2 .

It is a cyclic number.

It is not a de Polignac number, because 401389 - 2³ = 401381 is a prime.

It is a super-2 number, since 2×401389² = 322226258642, which contains 22 as substring.

It is a Duffinian number.

401389 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6892 + ... + 6949.

It is an arithmetic number, because the mean of its divisors is an integer number (103815).

2⁴⁰¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

401389 is a deficient number, since it is larger than the sum of its proper divisors (13871).

401389 is a wasteful number, since it uses less digits than its factorization.

401389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13870.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 401389 is about 633.5526813139. The cubic root of 401389 is about 73.7658167742.

The spelling of 401389 in words is "four hundred one thousand, three hundred eighty-nine".