1949991 has 8 divisors (see below), whose sum is σ = 2627184. Its totient is φ = 1286400.

The previous prime is 1949947. The next prime is 1949999. The reversal of 1949991 is 1999491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1949991 - 2¹³ = 1941799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3060 + ... + 3641.

It is an arithmetic number, because the mean of its divisors is an integer number (328398).

2^1949991 is an apocalyptic number.

1949991 is a deficient number, since it is larger than the sum of its proper divisors (677193).

1949991 is an equidigital number, since it uses as much as digits as its factorization.

1949991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6801.

The product of its digits is 26244, while the sum is 42.

The square root of 1949991 is about 1396.4207818562. The cubic root of 1949991 is about 124.9331055408.

It can be divided in two parts, 194999 and 1, that added together give a triangular number (195000 = T₆₂₄).

The spelling of 1949991 in words is "one million, nine hundred forty-nine thousand, nine hundred ninety-one".