190128406 has 8 divisors (see below), whose sum is σ = 307130544. Its totient is φ = 87751560.

The previous prime is 190128401. The next prime is 190128469. The reversal of 190128406 is 604821091.

It is a happy number.

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

It is a super-2 number, since 2×190128406² = 72297621536201672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190128401) 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, 3656290 + ... + 3656341.

It is an arithmetic number, because the mean of its divisors is an integer number (38391318).

Almost surely, 2^190128406 is an apocalyptic number.

190128406 is a deficient number, since it is larger than the sum of its proper divisors (117002138).

190128406 is a wasteful number, since it uses less digits than its factorization.

190128406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7312646.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 190128406 is about 13788.7057405690. The cubic root of 190128406 is about 575.0191862533.

Adding to 190128406 its reverse (604821091), we get a palindrome (794949497).

The spelling of 190128406 in words is "one hundred ninety million, one hundred twenty-eight thousand, four hundred six".