1909742 has 4 divisors (see below), whose sum is σ = 2864616. Its totient is φ = 954870.

The previous prime is 1909741. The next prime is 1909757. The reversal of 1909742 is 2479091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2479091 = 223 ⋅11117.

It is a super-2 number, since 2×1909742² = 7294229013128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1909699 and 1909708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 477434 + ... + 477437.

It is an arithmetic number, because the mean of its divisors is an integer number (716154).

2^1909742 is an apocalyptic number.

1909742 is a deficient number, since it is larger than the sum of its proper divisors (954874).

1909742 is an equidigital number, since it uses as much as digits as its factorization.

1909742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954873.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1909742 is about 1381.9341518321. The cubic root of 1909742 is about 124.0675577061.

The spelling of 1909742 in words is "one million, nine hundred nine thousand, seven hundred forty-two".