190293993 has 6 divisors (see below), whose sum is σ = 274869114. Its totient is φ = 126862656.

The previous prime is 190293989. The next prime is 190294001. The reversal of 190293993 is 399392091.

It can be written as a sum of positive squares in only one way, i.e., 187224489 + 3069504 = 13683^2 + 1752^2 .

It is not a de Polignac number, because 190293993 - 2² = 190293989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190293193) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10571880 + ... + 10571897.

It is an arithmetic number, because the mean of its divisors is an integer number (45811519).

Almost surely, 2^190293993 is an apocalyptic number.

It is an amenable number.

190293993 is a deficient number, since it is larger than the sum of its proper divisors (84575121).

190293993 is a wasteful number, since it uses less digits than its factorization.

190293993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21143783 (or 21143780 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 190293993 is about 13794.7088769571. The cubic root of 190293993 is about 575.1860700900.

The spelling of 190293993 in words is "one hundred ninety million, two hundred ninety-three thousand, nine hundred ninety-three".