7919906 has 4 divisors (see below), whose sum is σ = 11879862. Its totient is φ = 3959952.

The previous prime is 7919893. The next prime is 7919921. The reversal of 7919906 is 6099197.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6099197 = 13 ⋅469169.

It can be written as a sum of positive squares in only one way, i.e., 6806881 + 1113025 = 2609^2 + 1055^2 .

It is a super-2 number, since 2×7919906² = 125449822097672, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1979975 + ... + 1979978.

Almost surely, 2^7919906 is an apocalyptic number.

7919906 is a deficient number, since it is larger than the sum of its proper divisors (3959956).

7919906 is a wasteful number, since it uses less digits than its factorization.

7919906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959955.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 7919906 is about 2814.2327551217. The cubic root of 7919906 is about 199.3303100799.

The spelling of 7919906 in words is "seven million, nine hundred nineteen thousand, nine hundred six".