139428417 has 16 divisors (see below), whose sum is σ = 187886592. Its totient is φ = 91966800.

The previous prime is 139428353. The next prime is 139428431. The reversal of 139428417 is 714824931.

It is not a de Polignac number, because 139428417 - 2⁶ = 139428353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139428437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156748 + ... + 157634.

It is an arithmetic number, because the mean of its divisors is an integer number (11742912).

Almost surely, 2^139428417 is an apocalyptic number.

It is an amenable number.

139428417 is a deficient number, since it is larger than the sum of its proper divisors (48458175).

139428417 is a wasteful number, since it uses less digits than its factorization.

139428417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388.

The product of its digits is 48384, while the sum is 39.

The square root of 139428417 is about 11807.9810721393. The cubic root of 139428417 is about 518.5417936019.

The spelling of 139428417 in words is "one hundred thirty-nine million, four hundred twenty-eight thousand, four hundred seventeen".