139777247 has 8 divisors (see below), whose sum is σ = 148538736. Its totient is φ = 131075712.

The previous prime is 139777237. The next prime is 139777273. The reversal of 139777247 is 742777931.

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

It is not a de Polignac number, because 139777247 - 2¹⁶ = 139711711 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 (139777217) 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, 10133 + ... + 19550.

It is an arithmetic number, because the mean of its divisors is an integer number (18567342).

Almost surely, 2^139777247 is an apocalyptic number.

139777247 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

139777247 is a deficient number, since it is larger than the sum of its proper divisors (8761489).

139777247 is a wasteful number, since it uses less digits than its factorization.

139777247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29977.

The product of its digits is 518616, while the sum is 47.

The square root of 139777247 is about 11822.7427866803. The cubic root of 139777247 is about 518.9738726556.

The spelling of 139777247 in words is "one hundred thirty-nine million, seven hundred seventy-seven thousand, two hundred forty-seven".