6690403 has 8 divisors (see below), whose sum is σ = 6870528. Its totient is φ = 6511944.

The previous prime is 6690379. The next prime is 6690427. The reversal of 6690403 is 3040966.

It is an interprime number because it is at equal distance from previous prime (6690379) and next prime (6690427).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6690403 - 2¹³ = 6682211 is a prime.

It is a super-2 number, since 2×6690403² = 89522984604818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6690433) 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, 13050 + ... + 13552.

It is an arithmetic number, because the mean of its divisors is an integer number (858816).

Almost surely, 2^6690403 is an apocalyptic number.

6690403 is a deficient number, since it is larger than the sum of its proper divisors (180125).

6690403 is a wasteful number, since it uses less digits than its factorization.

6690403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 6690403 is about 2586.5813345031. The cubic root of 6690403 is about 188.4303086517.

The spelling of 6690403 in words is "six million, six hundred ninety thousand, four hundred three".