7978494 has 32 divisors (see below), whose sum is σ = 16450560. Its totient is φ = 2578752.

The previous prime is 7978471. The next prime is 7978519. The reversal of 7978494 is 4948797.

It is a happy number.

It is a super-3 number, since 3×7978494³ (a number of 22 digits) contains 333 as substring.

Its product of digits (508032) is a multiple of the sum of its prime divisors (384).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35667 + ... + 35889.

It is an arithmetic number, because the mean of its divisors is an integer number (514080).

Almost surely, 2^7978494 is an apocalyptic number.

7978494 is an abundant number, since it is smaller than the sum of its proper divisors (8472066).

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

7978494 is a wasteful number, since it uses less digits than its factorization.

7978494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384.

The product of its digits is 508032, while the sum is 48.

The square root of 7978494 is about 2824.6228066770. The cubic root of 7978494 is about 199.8206225000.

It can be divided in two parts, 79 and 78494, that multiplied together give a palindrome (6201026).

The spelling of 7978494 in words is "seven million, nine hundred seventy-eight thousand, four hundred ninety-four".