1949778 has 16 divisors (see below), whose sum is σ = 4332960. Its totient is φ = 649908.

The previous prime is 1949777. The next prime is 1949791. The reversal of 1949778 is 8779491.

It is not an unprimeable number, because it can be changed into a prime (1949771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18000 + ... + 18107.

It is an arithmetic number, because the mean of its divisors is an integer number (270810).

2^1949778 is an apocalyptic number.

1949778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1949778 is an abundant number, since it is smaller than the sum of its proper divisors (2383182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1949778 is a wasteful number, since it uses less digits than its factorization.

1949778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36118 (or 36112 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 1949778 is about 1396.3445133634. The cubic root of 1949778 is about 124.9285565077.

The spelling of 1949778 in words is "one million, nine hundred forty-nine thousand, seven hundred seventy-eight".