139075409 has 8 divisors (see below), whose sum is σ = 152389728. Its totient is φ = 125872960.

The previous prime is 139075361. The next prime is 139075423. The reversal of 139075409 is 904570931.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 139075409 - 2¹² = 139071313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139075009) 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, 25352 + ... + 30345.

It is an arithmetic number, because the mean of its divisors is an integer number (19048716).

Almost surely, 2^139075409 is an apocalyptic number.

It is an amenable number.

139075409 is a deficient number, since it is larger than the sum of its proper divisors (13314319).

139075409 is a wasteful number, since it uses less digits than its factorization.

139075409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55935.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 139075409 is about 11793.0237428744. The cubic root of 139075409 is about 518.1038051680.

The spelling of 139075409 in words is "one hundred thirty-nine million, seventy-five thousand, four hundred nine".