139420181 has 16 divisors (see below), whose sum is σ = 150436224. Its totient is φ = 128867904.

The previous prime is 139420159. The next prime is 139420201. The reversal of 139420181 is 181024931.

It is a cyclic number.

It is not a de Polignac number, because 139420181 - 2¹⁰ = 139419157 is a prime.

It is a super-2 number, since 2×139420181² = 38875973740145522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139420381) 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, 146750 + ... + 147696.

It is an arithmetic number, because the mean of its divisors is an integer number (9402264).

Almost surely, 2^139420181 is an apocalyptic number.

It is an amenable number.

139420181 is a deficient number, since it is larger than the sum of its proper divisors (11016043).

139420181 is a wasteful number, since it uses less digits than its factorization.

139420181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 139420181 is about 11807.6323198176. The cubic root of 139420181 is about 518.5315833583.

The spelling of 139420181 in words is "one hundred thirty-nine million, four hundred twenty thousand, one hundred eighty-one".