1906380 has 144 divisors (see below), whose sum is σ = 7076160. Its totient is φ = 405504.

The previous prime is 1906379. The next prime is 1906381. The reversal of 1906380 is 836091.

It is an interprime number because it is at equal distance from previous prime (1906379) and next prime (1906381).

It is not an unprimeable number, because it can be changed into a prime (1906381) 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 47 ways as a sum of consecutive naturals, for example, 21376 + ... + 21464.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2^1906380 is an apocalyptic number.

1906380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1906380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3538080).

1906380 is an abundant number, since it is smaller than the sum of its proper divisors (5169780).

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

1906380 is a wasteful number, since it uses less digits than its factorization.

1906380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1906380 is about 1380.7172049337. The cubic root of 1906380 is about 123.9947101455.

The spelling of 1906380 in words is "one million, nine hundred six thousand, three hundred eighty".