400234189 has 4 divisors (see below), whose sum is σ = 401756256. Its totient is φ = 398712124.

The previous prime is 400234151. The next prime is 400234193. The reversal of 400234189 is 981432004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400234189 - 2²¹ = 398137037 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400234189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400234139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760639 + ... + 761164.

It is an arithmetic number, because the mean of its divisors is an integer number (100439064).

Almost surely, 2^400234189 is an apocalyptic number.

It is an amenable number.

400234189 is a deficient number, since it is larger than the sum of its proper divisors (1522067).

400234189 is a wasteful number, since it uses less digits than its factorization.

400234189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522066.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 400234189 is about 20005.8538683056. The cubic root of 400234189 is about 736.9500649503.

The spelling of 400234189 in words is "four hundred million, two hundred thirty-four thousand, one hundred eighty-nine".