139389451 has 4 divisors (see below), whose sum is σ = 142355232. Its totient is φ = 136423672.

The previous prime is 139389431. The next prime is 139389461. The reversal of 139389451 is 154983931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139389451 - 2⁹ = 139388939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139389398 and 139389407.

It is not an unprimeable number, because it can be changed into a prime (139389421) 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 3 ways as a sum of consecutive naturals, for example, 1482820 + ... + 1482913.

It is an arithmetic number, because the mean of its divisors is an integer number (35588808).

Almost surely, 2^139389451 is an apocalyptic number.

139389451 is a deficient number, since it is larger than the sum of its proper divisors (2965781).

139389451 is an equidigital number, since it uses as much as digits as its factorization.

139389451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965780.

The product of its digits is 116640, while the sum is 43.

The square root of 139389451 is about 11806.3309711358. The cubic root of 139389451 is about 518.4934835502.

The spelling of 139389451 in words is "one hundred thirty-nine million, three hundred eighty-nine thousand, four hundred fifty-one".