139781235 has 32 divisors (see below), whose sum is σ = 254596608. Its totient is φ = 64824320.

The previous prime is 139781231. The next prime is 139781303. The reversal of 139781235 is 532187931.

It is not a de Polignac number, because 139781235 - 2² = 139781231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139781193 and 139781202.

It is not an unprimeable number, because it can be changed into a prime (139781231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14622 + ... + 22211.

It is an arithmetic number, because the mean of its divisors is an integer number (7956144).

Almost surely, 2^139781235 is an apocalyptic number.

139781235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

139781235 is a deficient number, since it is larger than the sum of its proper divisors (114815373).

139781235 is a wasteful number, since it uses less digits than its factorization.

139781235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36875.

The product of its digits is 45360, while the sum is 39.

The square root of 139781235 is about 11822.9114434643. The cubic root of 139781235 is about 518.9788082422.

The spelling of 139781235 in words is "one hundred thirty-nine million, seven hundred eighty-one thousand, two hundred thirty-five".