1969990 has 16 divisors (see below), whose sum is σ = 3868560. Its totient is φ = 716320.

The previous prime is 1969987. The next prime is 1969993. The reversal of 1969990 is 999691.

It is an interprime number because it is at equal distance from previous prime (1969987) and next prime (1969993).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1969993) 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, 8845 + ... + 9064.

It is an arithmetic number, because the mean of its divisors is an integer number (241785).

2^1969990 is an apocalyptic number.

1969990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1969990 is a deficient number, since it is larger than the sum of its proper divisors (1898570).

1969990 is a wasteful number, since it uses less digits than its factorization.

1969990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17927.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 1969990 is about 1403.5633224048. The cubic root of 1969990 is about 125.3587560345.

Subtracting from 1969990 its reverse (999691), we obtain a cube (970299 = 99³).

The spelling of 1969990 in words is "one million, nine hundred sixty-nine thousand, nine hundred ninety".