102557839 has 4 divisors (see below), whose sum is σ = 107955640. Its totient is φ = 97160040.

The previous prime is 102557837. The next prime is 102557869. The reversal of 102557839 is 938755201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938755201 = 29 ⋅32370869.

It is a cyclic number.

It is not a de Polignac number, because 102557839 - 2¹ = 102557837 is a prime.

It is a super-2 number, since 2×102557839² = 21036220680699842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102557837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2698872 + ... + 2698909.

It is an arithmetic number, because the mean of its divisors is an integer number (26988910).

Almost surely, 2^102557839 is an apocalyptic number.

102557839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

102557839 is a deficient number, since it is larger than the sum of its proper divisors (5397801).

102557839 is an equidigital number, since it uses as much as digits as its factorization.

102557839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5397800.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 102557839 is about 10127.0844274154. The cubic root of 102557839 is about 468.0830918162.

The spelling of 102557839 in words is "one hundred two million, five hundred fifty-seven thousand, eight hundred thirty-nine".