103890945 has 16 divisors (see below), whose sum is σ = 166364352. Its totient is φ = 55362240.

The previous prime is 103890929. The next prime is 103890973. The reversal of 103890945 is 549098301.

It is not a de Polignac number, because 103890945 - 2⁴ = 103890929 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23350 + ... + 27440.

It is an arithmetic number, because the mean of its divisors is an integer number (10397772).

It is a Proth number, since it is equal to 6341 ⋅ 2¹⁴ + 1 and 6341 < 2¹⁴.

Almost surely, 2^103890945 is an apocalyptic number.

103890945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

103890945 is a deficient number, since it is larger than the sum of its proper divisors (62473407).

103890945 is a wasteful number, since it uses less digits than its factorization.

103890945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5792.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 103890945 is about 10192.6907634834. The cubic root of 103890945 is about 470.1025051812.

The spelling of 103890945 in words is "one hundred three million, eight hundred ninety thousand, nine hundred forty-five".