139437805 has 8 divisors (see below), whose sum is σ = 180196632. Its totient is φ = 102969408.

The previous prime is 139437803. The next prime is 139437817. The reversal of 139437805 is 508734931.

It can be written as a sum of positive squares in 4 ways, for example, as 56169 + 139381636 = 237^2 + 11806^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139437805 - 2¹ = 139437803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139437803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1072534 + ... + 1072663.

It is an arithmetic number, because the mean of its divisors is an integer number (22524579).

Almost surely, 2^139437805 is an apocalyptic number.

It is an amenable number.

139437805 is a deficient number, since it is larger than the sum of its proper divisors (40758827).

139437805 is a wasteful number, since it uses less digits than its factorization.

139437805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145215.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 139437805 is about 11808.3785931854. The cubic root of 139437805 is about 518.5534315000.

The spelling of 139437805 in words is "one hundred thirty-nine million, four hundred thirty-seven thousand, eight hundred five".