139991455 has 8 divisors (see below), whose sum is σ = 175293792. Its totient is φ = 107123808.

The previous prime is 139991437. The next prime is 139991459. The reversal of 139991455 is 554199931.

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 a de Polignac number, because none of the positive numbers 2^k-139991455 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139991459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 608544 + ... + 608773.

It is an arithmetic number, because the mean of its divisors is an integer number (21911724).

Almost surely, 2^139991455 is an apocalyptic number.

139991455 is a deficient number, since it is larger than the sum of its proper divisors (35302337).

139991455 is a wasteful number, since it uses less digits than its factorization.

139991455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217345.

The product of its digits is 218700, while the sum is 46.

The square root of 139991455 is about 11831.7984685339. The cubic root of 139991455 is about 519.2388457173.

The spelling of 139991455 in words is "one hundred thirty-nine million, nine hundred ninety-one thousand, four hundred fifty-five".