139237971 has 8 divisors (see below), whose sum is σ = 187564944. Its totient is φ = 91868160.

The previous prime is 139237963. The next prime is 139237997. The reversal of 139237971 is 179732931.

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

It is not a de Polignac number, because 139237971 - 2³ = 139237963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139237921) 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, 238950 + ... + 239531.

It is an arithmetic number, because the mean of its divisors is an integer number (23445618).

Almost surely, 2^139237971 is an apocalyptic number.

139237971 is a deficient number, since it is larger than the sum of its proper divisors (48326973).

139237971 is an equidigital number, since it uses as much as digits as its factorization.

139237971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478581.

The product of its digits is 71442, while the sum is 42.

The square root of 139237971 is about 11799.9140251105. The cubic root of 139237971 is about 518.3055930491.

The spelling of 139237971 in words is "one hundred thirty-nine million, two hundred thirty-seven thousand, nine hundred seventy-one".