401690643 has 8 divisors (see below), whose sum is σ = 535681488. Its totient is φ = 267746784.

The previous prime is 401690599. The next prime is 401690669. The reversal of 401690643 is 346096104.

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

It is not a de Polignac number, because 401690643 - 2⁶ = 401690579 is a prime.

It is a super-2 number, since 2×401690643² = 322710745347506898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401697643) 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, 22321 + ... + 36077.

It is an arithmetic number, because the mean of its divisors is an integer number (66960186).

Almost surely, 2^401690643 is an apocalyptic number.

401690643 is a deficient number, since it is larger than the sum of its proper divisors (133990845).

401690643 is a wasteful number, since it uses less digits than its factorization.

401690643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23493.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 401690643 is about 20042.2215086053. The cubic root of 401690643 is about 737.8429043341.

The spelling of 401690643 in words is "four hundred one million, six hundred ninety thousand, six hundred forty-three".