1991374 has 32 divisors (see below), whose sum is σ = 3799296. Its totient is φ = 760320.

The previous prime is 1991359. The next prime is 1991387. The reversal of 1991374 is 4731991.

It is a d-powerful number, because it can be written as 1 + 9⁵ + 9⁵ + 1 + 3¹³ + 7⁵ + 4⁹ .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10222 + ... + 10414.

It is an arithmetic number, because the mean of its divisors is an integer number (118728).

2^1991374 is an apocalyptic number.

1991374 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1991374 is a deficient number, since it is larger than the sum of its proper divisors (1807922).

1991374 is a wasteful number, since it uses less digits than its factorization.

1991374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280.

The product of its digits is 6804, while the sum is 34.

The square root of 1991374 is about 1411.1605153206. The cubic root of 1991374 is about 125.8107093029.

The spelling of 1991374 in words is "one million, nine hundred ninety-one thousand, three hundred seventy-four".