401647 has 4 divisors (see below), whose sum is σ = 407376. Its totient is φ = 395920.

The previous prime is 401629. The next prime is 401651. The reversal of 401647 is 746104.

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

It is a cyclic number.

It is not a de Polignac number, because 401647 - 2⁷ = 401519 is a prime.

It is a super-2 number, since 2×401647² = 322640625218, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401627) 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, 2758 + ... + 2899.

It is an arithmetic number, because the mean of its divisors is an integer number (101844).

2⁴⁰¹⁶⁴⁷ is an apocalyptic number.

401647 is a deficient number, since it is larger than the sum of its proper divisors (5729).

401647 is an equidigital number, since it uses as much as digits as its factorization.

401647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 401647 is about 633.7562622965. The cubic root of 401647 is about 73.7816181577.

The spelling of 401647 in words is "four hundred one thousand, six hundred forty-seven".