78403039 has 12 divisors (see below), whose sum is σ = 92809528. Its totient is φ = 65791440.

The previous prime is 78403027. The next prime is 78403043. The reversal of 78403039 is 93030487.

It is not a de Polignac number, because 78403039 - 2⁵ = 78403007 is a prime.

It is a super-2 number, since 2×78403039² = 12294073048871042, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78402995 and 78403013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78403019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23349 + ... + 26494.

Almost surely, 2^78403039 is an apocalyptic number.

78403039 is a deficient number, since it is larger than the sum of its proper divisors (14406489).

78403039 is a wasteful number, since it uses less digits than its factorization.

78403039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49878 (or 49867 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 78403039 is about 8854.5490568408. The cubic root of 78403039 is about 428.0005222429. Note that the first 3 decimals are identical.

The spelling of 78403039 in words is "seventy-eight million, four hundred three thousand, thirty-nine".