190442813 has 4 divisors (see below), whose sum is σ = 207755808. Its totient is φ = 173129820.

The previous prime is 190442809. The next prime is 190442821. The reversal of 190442813 is 318244091.

It is a happy number.

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 190442813 - 2² = 190442809 is a prime.

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 190442813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190442893) 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, 8656481 + ... + 8656502.

It is an arithmetic number, because the mean of its divisors is an integer number (51938952).

Almost surely, 2^190442813 is an apocalyptic number.

It is an amenable number.

190442813 is a deficient number, since it is larger than the sum of its proper divisors (17312995).

190442813 is a wasteful number, since it uses less digits than its factorization.

190442813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17312994.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 190442813 is about 13800.1019199135. The cubic root of 190442813 is about 575.3359730286.

The spelling of 190442813 in words is "one hundred ninety million, four hundred forty-two thousand, eight hundred thirteen".