139649397 has 8 divisors (see below), whose sum is σ = 186368640. Its totient is φ = 93014880.

The previous prime is 139649381. The next prime is 139649417. The reversal of 139649397 is 793946931.

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

It is not a de Polignac number, because 139649397 - 2⁴ = 139649381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139649897) 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, 17229 + ... + 24002.

It is an arithmetic number, because the mean of its divisors is an integer number (23296080).

Almost surely, 2^139649397 is an apocalyptic number.

It is an amenable number.

139649397 is a deficient number, since it is larger than the sum of its proper divisors (46719243).

139649397 is a wasteful number, since it uses less digits than its factorization.

139649397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42363.

The product of its digits is 1102248, while the sum is 51.

The square root of 139649397 is about 11817.3345979540. The cubic root of 139649397 is about 518.8155945118.

The spelling of 139649397 in words is "one hundred thirty-nine million, six hundred forty-nine thousand, three hundred ninety-seven".