401649 has 8 divisors (see below), whose sum is σ = 558912. Its totient is φ = 256080.

The previous prime is 401629. The next prime is 401651. The reversal of 401649 is 946104.

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

It is not a de Polignac number, because 401649 - 2⁸ = 401393 is a prime.

It is a super-2 number, since 2×401649² = 322643838402, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (401629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2842 + ... + 2979.

It is an arithmetic number, because the mean of its divisors is an integer number (69864).

2⁴⁰¹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

401649 is a deficient number, since it is larger than the sum of its proper divisors (157263).

401649 is a wasteful number, since it uses less digits than its factorization.

401649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5847.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 401649 is about 633.7578401882. The cubic root of 401649 is about 73.7817406226.

The spelling of 401649 in words is "four hundred one thousand, six hundred forty-nine".