401969 has 8 divisors (see below), whose sum is σ = 423360. Its totient is φ = 381136.

The previous prime is 401959. The next prime is 401981. The reversal of 401969 is 969104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 401969 - 2⁴ = 401953 is a prime.

It is a super-2 number, since 2×401969² = 323158153922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (401909) 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 7 ways as a sum of consecutive naturals, for example, 2324 + ... + 2490.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2⁴⁰¹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

401969 is a deficient number, since it is larger than the sum of its proper divisors (21391).

401969 is a wasteful number, since it uses less digits than its factorization.

401969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 401969 is about 634.0102522830. The cubic root of 401969 is about 73.8013297743.

401969 divided by its sum of digits (29) gives a triangular number (13861 = T₁₆₆).

The spelling of 401969 in words is "four hundred one thousand, nine hundred sixty-nine".