400289389 has 8 divisors (see below), whose sum is σ = 403200000. Its totient is φ = 397389552.

The previous prime is 400289387. The next prime is 400289399. The reversal of 400289389 is 983982004.

It is a happy number.

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 400289389 - 2¹ = 400289387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400289387) 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, 81012 + ... + 85810.

It is an arithmetic number, because the mean of its divisors is an integer number (50400000).

Almost surely, 2^400289389 is an apocalyptic number.

It is an amenable number.

400289389 is a deficient number, since it is larger than the sum of its proper divisors (2910611).

400289389 is a wasteful number, since it uses less digits than its factorization.

400289389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5387.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 400289389 is about 20007.2334169420. The cubic root of 400289389 is about 736.9839432601.

The spelling of 400289389 in words is "four hundred million, two hundred eighty-nine thousand, three hundred eighty-nine".