1908397 has 4 divisors (see below), whose sum is σ = 1911676. Its totient is φ = 1905120.

The previous prime is 1908373. The next prime is 1908407. The reversal of 1908397 is 7938091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 385641 + 1522756 = 621^2 + 1234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1908397 - 2¹⁹ = 1384109 is a prime.

It is a Duffinian number.

1908397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1908317) 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 in 3 ways as a sum of consecutive naturals, for example, 504 + ... + 2017.

It is an arithmetic number, because the mean of its divisors is an integer number (477919).

2^1908397 is an apocalyptic number.

It is an amenable number.

1908397 is a deficient number, since it is larger than the sum of its proper divisors (3279).

1908397 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 11 representation: 1908397 = (1093897)₁₁.

1908397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1908397 is about 1381.4474293291. The cubic root of 1908397 is about 124.0384246164.

The spelling of 1908397 in words is "one million, nine hundred eight thousand, three hundred ninety-seven".