139451 has 8 divisors (see below), whose sum is σ = 159264. Its totient is φ = 120960.

The previous prime is 139439. The next prime is 139457. The reversal of 139451 is 154931.

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 not a de Polignac number, because 139451 - 2⁶ = 139387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139457) 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, 95 + ... + 536.

It is an arithmetic number, because the mean of its divisors is an integer number (19908).

2¹³⁹⁴⁵¹ is an apocalyptic number.

139451 is a deficient number, since it is larger than the sum of its proper divisors (19813).

139451 is a wasteful number, since it uses less digits than its factorization.

139451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661.

The product of its digits is 540, while the sum is 23.

The square root of 139451 is about 373.4313859332. The cubic root of 139451 is about 51.8569787888.

The spelling of 139451 in words is "one hundred thirty-nine thousand, four hundred fifty-one".