78403947 has 8 divisors (see below), whose sum is σ = 104596800. Its totient is φ = 52240200.

The previous prime is 78403939. The next prime is 78403961. The reversal of 78403947 is 74930487.

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

It is not a de Polignac number, because 78403947 - 2³ = 78403939 is a prime.

It is a super-2 number, since 2×78403947² = 12294357810357618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78403899 and 78403908.

It is not an unprimeable number, because it can be changed into a prime (78403967) 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, 72 + ... + 12522.

It is an arithmetic number, because the mean of its divisors is an integer number (13074600).

Almost surely, 2^78403947 is an apocalyptic number.

78403947 is a deficient number, since it is larger than the sum of its proper divisors (26192853).

78403947 is a wasteful number, since it uses less digits than its factorization.

78403947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14553.

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 78403947 is about 8854.6003297721. The cubic root of 78403947 is about 428.0021744875.

The spelling of 78403947 in words is "seventy-eight million, four hundred three thousand, nine hundred forty-seven".