78940947 has 8 divisors (see below), whose sum is σ = 105324544. Its totient is φ = 52592328.

The previous prime is 78940933. The next prime is 78940963. The reversal of 78940947 is 74904987.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78940947 - 2⁴ = 78940931 is a prime.

It is a super-2 number, since 2×78940947² = 12463346226513618, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78940896 and 78940905.

It is not an unprimeable number, because it can be changed into a prime (78940247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2923 + ... + 12900.

It is an arithmetic number, because the mean of its divisors is an integer number (13165568).

Almost surely, 2^78940947 is an apocalyptic number.

78940947 is a deficient number, since it is larger than the sum of its proper divisors (26383597).

78940947 is a wasteful number, since it uses less digits than its factorization.

78940947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17489.

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

The square root of 78940947 is about 8884.8718054905. The cubic root of 78940947 is about 428.9771017060.

The spelling of 78940947 in words is "seventy-eight million, nine hundred forty thousand, nine hundred forty-seven".