401670987 has 8 divisors (see below), whose sum is σ = 535657536. Its totient is φ = 267732552.

The previous prime is 401670979. The next prime is 401670989. The reversal of 401670987 is 789076104.

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

It is not a de Polignac number, because 401670987 - 2³ = 401670979 is a prime.

It is a super-2 number, since 2×401670987² = 322679163595108338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401670989) 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, 18588 + ... + 33894.

It is an arithmetic number, because the mean of its divisors is an integer number (66957192).

Almost surely, 2^401670987 is an apocalyptic number.

401670987 is a deficient number, since it is larger than the sum of its proper divisors (133986549).

401670987 is a wasteful number, since it uses less digits than its factorization.

401670987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24057.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 401670987 is about 20041.7311378034. The cubic root of 401670987 is about 737.8308691383.

The spelling of 401670987 in words is "four hundred one million, six hundred seventy thousand, nine hundred eighty-seven".