1949899 has 4 divisors (see below), whose sum is σ = 2228464. Its totient is φ = 1671336.

The previous prime is 1949887. The next prime is 1949911. The reversal of 1949899 is 9989491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9989491 = 191 ⋅52301.

It is an interprime number because it is at equal distance from previous prime (1949887) and next prime (1949911).

It is a cyclic number.

It is not a de Polignac number, because 1949899 - 2⁷ = 1949771 is a prime.

It is a super-2 number, since 2×1949899² = 7604212220402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1949809) 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 3 ways as a sum of consecutive naturals, for example, 139272 + ... + 139285.

It is an arithmetic number, because the mean of its divisors is an integer number (557116).

2^1949899 is an apocalyptic number.

1949899 is a deficient number, since it is larger than the sum of its proper divisors (278565).

1949899 is an equidigital number, since it uses as much as digits as its factorization.

1949899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278564.

The product of its digits is 209952, while the sum is 49.

The square root of 1949899 is about 1396.3878401075. The cubic root of 1949899 is about 124.9311407409.

The spelling of 1949899 in words is "one million, nine hundred forty-nine thousand, eight hundred ninety-nine".