139433481 has 20 divisors (see below), whose sum is σ = 227226384. Its totient is φ = 84504600.

The previous prime is 139433453. The next prime is 139433543. The reversal of 139433481 is 184334931.

139433481 is a `hidden beast` number, since 139 + 43 + 3 + 481 = 666.

It is not a de Polignac number, because 139433481 - 2¹⁸ = 139171337 is a prime.

It is a super-2 number, since 2×139433481² = 38883391247554722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139433081) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 77355 + ... + 79136.

Almost surely, 2^139433481 is an apocalyptic number.

139433481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

139433481 is a deficient number, since it is larger than the sum of its proper divisors (87792903).

139433481 is a wasteful number, since it uses less digits than its factorization.

139433481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156514 (or 156505 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 139433481 is about 11808.1955014304. The cubic root of 139433481 is about 518.5480712888.

It can be divided in two parts, 13943 and 3481, that added together give a square (17424 = 132²).

The spelling of 139433481 in words is "one hundred thirty-nine million, four hundred thirty-three thousand, four hundred eighty-one".