747978 has 32 divisors (see below), whose sum is σ = 1866240. Its totient is φ = 194160.

The previous prime is 747977. The next prime is 747979. The reversal of 747978 is 879747.

It is an interprime number because it is at equal distance from previous prime (747977) and next prime (747979).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (747977) 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 15 ways as a sum of consecutive naturals, for example, 348 + ... + 1271.

It is an arithmetic number, because the mean of its divisors is an integer number (58320).

2⁷⁴⁷⁹⁷⁸ is an apocalyptic number.

747978 is an abundant number, since it is smaller than the sum of its proper divisors (1118262).

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

747978 is a wasteful number, since it uses less digits than its factorization.

747978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642.

The product of its digits is 98784, while the sum is 42.

The square root of 747978 is about 864.8572136486. The cubic root of 747978 is about 90.7743068707.

Subtracting 747978 from its reverse (879747), we obtain a square (131769 = 363²).

It can be divided in two parts, 7479 and 78, that added together give a palindrome (7557).

The spelling of 747978 in words is "seven hundred forty-seven thousand, nine hundred seventy-eight".