78983431 has 4 divisors (see below), whose sum is σ = 79002000. Its totient is φ = 78964864.

The previous prime is 78983423. The next prime is 78983473. The reversal of 78983431 is 13438987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13438987 = 659 ⋅20393.

It is a cyclic number.

It is not a de Polignac number, because 78983431 - 2³ = 78983423 is a prime.

It is a super-2 number, since 2×78983431² = 12476764745063522, 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 (78983731) 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, 615 + ... + 12583.

It is an arithmetic number, because the mean of its divisors is an integer number (19750500).

Almost surely, 2^78983431 is an apocalyptic number.

78983431 is a deficient number, since it is larger than the sum of its proper divisors (18569).

78983431 is a wasteful number, since it uses less digits than its factorization.

78983431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18568.

The product of its digits is 145152, while the sum is 43.

The square root of 78983431 is about 8887.2622893667. The cubic root of 78983431 is about 429.0540427423.

The spelling of 78983431 in words is "seventy-eight million, nine hundred eighty-three thousand, four hundred thirty-one".