139400537 has 4 divisors (see below), whose sum is σ = 139459380. Its totient is φ = 139341696.

The previous prime is 139400531. The next prime is 139400551. The reversal of 139400537 is 735004931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50965321 + 88435216 = 7139^2 + 9404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139400537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139400531) 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 3 ways as a sum of consecutive naturals, for example, 25712 + ... + 30657.

It is an arithmetic number, because the mean of its divisors is an integer number (34864845).

Almost surely, 2^139400537 is an apocalyptic number.

It is an amenable number.

139400537 is a deficient number, since it is larger than the sum of its proper divisors (58843).

139400537 is an equidigital number, since it uses as much as digits as its factorization.

139400537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58842.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 139400537 is about 11806.8004556696. The cubic root of 139400537 is about 518.5072288907.

The spelling of 139400537 in words is "one hundred thirty-nine million, four hundred thousand, five hundred thirty-seven".