400187389 has 8 divisors (see below), whose sum is σ = 464855168. Its totient is φ = 337394160.

The previous prime is 400187341. The next prime is 400187393. The reversal of 400187389 is 983781004.

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 400187389 - 2⁷ = 400187261 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 (400187989) 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, 468177 + ... + 469030.

It is an arithmetic number, because the mean of its divisors is an integer number (58106896).

Almost surely, 2^400187389 is an apocalyptic number.

It is an amenable number.

400187389 is a deficient number, since it is larger than the sum of its proper divisors (64667779).

400187389 is an equidigital number, since it uses as much as digits as its factorization.

400187389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937275.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 400187389 is about 20004.6841764623. The cubic root of 400187389 is about 736.9213395954.

The spelling of 400187389 in words is "four hundred million, one hundred eighty-seven thousand, three hundred eighty-nine".