102439747 has 2 divisors, whose sum is σ = 102439748. Its totient is φ = 102439746.

The previous prime is 102439709. The next prime is 102439751. The reversal of 102439747 is 747934201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102439747 is a prime.

It is not a weakly prime, because it can be changed into another prime (102439787) 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 as a sum of consecutive naturals, namely, 51219873 + 51219874.

It is an arithmetic number, because the mean of its divisors is an integer number (51219874).

Almost surely, 2^102439747 is an apocalyptic number.

102439747 is a deficient number, since it is larger than the sum of its proper divisors (1).

102439747 is an equidigital number, since it uses as much as digits as its factorization.

102439747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 102439747 is about 10121.2522446583. The cubic root of 102439747 is about 467.9033620198.

The spelling of 102439747 in words is "one hundred two million, four hundred thirty-nine thousand, seven hundred forty-seven".