78349943 has 4 divisors (see below), whose sum is σ = 89542800. Its totient is φ = 67157088.

The previous prime is 78349933. The next prime is 78349949. The reversal of 78349943 is 34994387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34994387 = 29 ⋅1206703.

It is a cyclic number.

It is not a de Polignac number, because 78349943 - 2⁶ = 78349879 is a prime.

It is a super-2 number, since 2×78349943² = 12277427136206498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78349949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5596418 + ... + 5596431.

It is an arithmetic number, because the mean of its divisors is an integer number (22385700).

Almost surely, 2^78349943 is an apocalyptic number.

78349943 is a deficient number, since it is larger than the sum of its proper divisors (11192857).

78349943 is a wasteful number, since it uses less digits than its factorization.

78349943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11192856.

The product of its digits is 653184, while the sum is 47.

The square root of 78349943 is about 8851.5503161876. The cubic root of 78349943 is about 427.9038837797.

The spelling of 78349943 in words is "seventy-eight million, three hundred forty-nine thousand, nine hundred forty-three".