16939191 has 16 divisors (see below), whose sum is σ = 24500448. Its totient is φ = 10368000.

The previous prime is 16939189. The next prime is 16939213. The reversal of 16939191 is 19193961.

It is a happy number.

It is not a de Polignac number, because 16939191 - 2¹ = 16939189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16939591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1960 + ... + 6141.

It is an arithmetic number, because the mean of its divisors is an integer number (1531278).

Almost surely, 2^16939191 is an apocalyptic number.

16939191 is a deficient number, since it is larger than the sum of its proper divisors (7561257).

16939191 is a wasteful number, since it uses less digits than its factorization.

16939191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8162.

The product of its digits is 13122, while the sum is 39.

The square root of 16939191 is about 4115.7248450303. The cubic root of 16939191 is about 256.8212103142.

The spelling of 16939191 in words is "sixteen million, nine hundred thirty-nine thousand, one hundred ninety-one".