7978136 has 8 divisors (see below), whose sum is σ = 14959020. Its totient is φ = 3989064.

The previous prime is 7978099. The next prime is 7978169. The reversal of 7978136 is 6318797.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×7978136³ (a number of 22 digits) contains 333 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7978093 and 7978102.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 498626 + ... + 498641.

Almost surely, 2^7978136 is an apocalyptic number.

It is an amenable number.

7978136 is a deficient number, since it is larger than the sum of its proper divisors (6980884).

7978136 is a wasteful number, since it uses less digits than its factorization.

7978136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997273 (or 997269 counting only the distinct ones).

The product of its digits is 63504, while the sum is 41.

The square root of 7978136 is about 2824.5594346730. The cubic root of 7978136 is about 199.8176337633.

The spelling of 7978136 in words is "seven million, nine hundred seventy-eight thousand, one hundred thirty-six".