401789 has 4 divisors (see below), whose sum is σ = 407520. Its totient is φ = 396060.

The previous prime is 401773. The next prime is 401809. The reversal of 401789 is 987104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401789 - 2⁴ = 401773 is a prime.

It is a super-2 number, since 2×401789² = 322868801042, 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 (401689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2759 + ... + 2900.

It is an arithmetic number, because the mean of its divisors is an integer number (101880).

2⁴⁰¹⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

401789 is a deficient number, since it is larger than the sum of its proper divisors (5731).

401789 is an equidigital number, since it uses as much as digits as its factorization.

401789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5730.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 401789 is about 633.8682828475. The cubic root of 401789 is about 73.7903121563.

The spelling of 401789 in words is "four hundred one thousand, seven hundred eighty-nine".