400826989 has 8 divisors (see below), whose sum is σ = 406064960. Its totient is φ = 395611776.

The previous prime is 400826977. The next prime is 400827001. The reversal of 400826989 is 989628004.

It is an interprime number because it is at equal distance from previous prime (400826977) and next prime (400827001).

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

It is a cyclic number.

It is not a de Polignac number, because 400826989 - 2⁹ = 400826477 is a prime.

It is a super-2 number, since 2×400826989² = 321324550221612242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400826939) 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, 31312 + ... + 42214.

It is an arithmetic number, because the mean of its divisors is an integer number (50758120).

Almost surely, 2^400826989 is an apocalyptic number.

It is an amenable number.

400826989 is a deficient number, since it is larger than the sum of its proper divisors (5237971).

400826989 is a wasteful number, since it uses less digits than its factorization.

400826989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11379.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 400826989 is about 20020.6640499260. The cubic root of 400826989 is about 737.3137257796.

The spelling of 400826989 in words is "four hundred million, eight hundred twenty-six thousand, nine hundred eighty-nine".