190399749 has 4 divisors (see below), whose sum is σ = 253866336. Its totient is φ = 126933164.

The previous prime is 190399721. The next prime is 190399751. The reversal of 190399749 is 947993091.

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 190399749 - 2⁷ = 190399621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190399049) 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, 31733289 + ... + 31733294.

It is an arithmetic number, because the mean of its divisors is an integer number (63466584).

Almost surely, 2^190399749 is an apocalyptic number.

It is an amenable number.

190399749 is a deficient number, since it is larger than the sum of its proper divisors (63466587).

190399749 is an equidigital number, since it uses as much as digits as its factorization.

190399749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63466586.

The product of its (nonzero) digits is 551124, while the sum is 51.

The square root of 190399749 is about 13798.5415533672. The cubic root of 190399749 is about 575.2926036907.

The spelling of 190399749 in words is "one hundred ninety million, three hundred ninety-nine thousand, seven hundred forty-nine".