51839139 has 8 divisors (see below), whose sum is σ = 75402432. Its totient is φ = 31417640.

The previous prime is 51839131. The next prime is 51839147. The reversal of 51839139 is 93193815.

It is an interprime number because it is at equal distance from previous prime (51839131) and next prime (51839147).

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 51839139 - 2³ = 51839131 is a prime.

It is a super-2 number, since 2×51839139² = 5374592664522642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51839097 and 51839106.

It is not an unprimeable number, because it can be changed into a prime (51839131) 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, 785409 + ... + 785474.

It is an arithmetic number, because the mean of its divisors is an integer number (9425304).

Almost surely, 2^51839139 is an apocalyptic number.

51839139 is a deficient number, since it is larger than the sum of its proper divisors (23563293).

51839139 is a wasteful number, since it uses less digits than its factorization.

51839139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570897.

The product of its digits is 29160, while the sum is 39.

The square root of 51839139 is about 7199.9402080851. The cubic root of 51839139 is about 372.8658364074.

The spelling of 51839139 in words is "fifty-one million, eight hundred thirty-nine thousand, one hundred thirty-nine".