43139405 has 16 divisors (see below), whose sum is σ = 54655680. Its totient is φ = 32596992.

The previous prime is 43139399. The next prime is 43139407. The reversal of 43139405 is 50493134.

It is a cyclic number.

It is not a de Polignac number, because 43139405 - 2⁴ = 43139389 is a prime.

It is a super-2 number, since 2×43139405² = 3722016527508050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43139407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54422 + ... + 55208.

It is an arithmetic number, because the mean of its divisors is an integer number (3415980).

Almost surely, 2^43139405 is an apocalyptic number.

It is an amenable number.

43139405 is a deficient number, since it is larger than the sum of its proper divisors (11516275).

43139405 is a wasteful number, since it uses less digits than its factorization.

43139405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 43139405 is about 6568.0594546639. The cubic root of 43139405 is about 350.7179954734.

The spelling of 43139405 in words is "forty-three million, one hundred thirty-nine thousand, four hundred five".