139761409 has 8 divisors (see below), whose sum is σ = 148942080. Its totient is φ = 130839456.

The previous prime is 139761373. The next prime is 139761449. The reversal of 139761409 is 904167931.

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

It is not a de Polignac number, because 139761409 - 2⁹ = 139760897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139761449) 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, 63564 + ... + 65725.

It is an arithmetic number, because the mean of its divisors is an integer number (18617760).

Almost surely, 2^139761409 is an apocalyptic number.

It is an amenable number.

139761409 is a deficient number, since it is larger than the sum of its proper divisors (9180671).

139761409 is a wasteful number, since it uses less digits than its factorization.

139761409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129359.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 139761409 is about 11822.0729569733. The cubic root of 139761409 is about 518.9542704699.

The spelling of 139761409 in words is "one hundred thirty-nine million, seven hundred sixty-one thousand, four hundred nine".