139540731 has 16 divisors (see below), whose sum is σ = 213651840. Its totient is φ = 80118720.

The previous prime is 139540729. The next prime is 139540757. The reversal of 139540731 is 137045931.

139540731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139540731 - 2¹ = 139540729 is a prime.

It is a super-2 number, since 2×139540731² = 38943231216028722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 139540692 and 139540701.

It is not an unprimeable number, because it can be changed into a prime (139540231) 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, 110650 + ... + 111903.

It is an arithmetic number, because the mean of its divisors is an integer number (13353240).

Almost surely, 2^139540731 is an apocalyptic number.

139540731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

139540731 is a deficient number, since it is larger than the sum of its proper divisors (74111109).

139540731 is a wasteful number, since it uses less digits than its factorization.

139540731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222586.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 139540731 is about 11812.7359658971. The cubic root of 139540731 is about 518.6809901716.

The spelling of 139540731 in words is "one hundred thirty-nine million, five hundred forty thousand, seven hundred thirty-one".