6999990 has 32 divisors (see below), whose sum is σ = 16873056. Its totient is φ = 1858560.

The previous prime is 6999989. The next prime is 6999997. The reversal of 6999990 is 999996.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6999997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10260 + ... + 10920.

It is an arithmetic number, because the mean of its divisors is an integer number (527283).

Almost surely, 2^6999990 is an apocalyptic number.

6999990 is an abundant number, since it is smaller than the sum of its proper divisors (9873066).

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

6999990 is a wasteful number, since it uses less digits than its factorization.

6999990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024.

The product of its (nonzero) digits is 354294, while the sum is 51.

The square root of 6999990 is about 2645.7494212416. The cubic root of 6999990 is about 191.2930271852.

The spelling of 6999990 in words is "six million, nine hundred ninety-nine thousand, nine hundred ninety".