1909949167 has 16 divisors (see below), whose sum is σ = 2337180480. Its totient is φ = 1523478528.

The previous prime is 1909949159. The next prime is 1909949183. The reversal of 1909949167 is 7619499091.

It is not a de Polignac number, because 1909949167 - 2³ = 1909949159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909949137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79578 + ... + 100759.

It is an arithmetic number, because the mean of its divisors is an integer number (146073780).

Almost surely, 2^1909949167 is an apocalyptic number.

1909949167 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1909949167 is a deficient number, since it is larger than the sum of its proper divisors (427231313).

1909949167 is a wasteful number, since it uses less digits than its factorization.

1909949167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180450.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The square root of 1909949167 is about 43702.9651968834. The cubic root of 1909949167 is about 1240.7204378754.

The spelling of 1909949167 in words is "one billion, nine hundred nine million, nine hundred forty-nine thousand, one hundred sixty-seven".