55139742 has 48 divisors (see below), whose sum is σ = 139456512. Its totient is φ = 15417360.

The previous prime is 55139741. The next prime is 55139743. The reversal of 55139742 is 24793155.

55139742 is a `hidden beast` number, since 551 + 39 + 74 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (55139741) and next prime (55139743).

It is a super-2 number, since 2×55139742² = 6080782295653128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55139697 and 55139706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55139741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1267 + ... + 10577.

It is an arithmetic number, because the mean of its divisors is an integer number (2905344).

Almost surely, 2^55139742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55139742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69728256).

55139742 is an abundant number, since it is smaller than the sum of its proper divisors (84316770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55139742 is a wasteful number, since it uses less digits than its factorization.

55139742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9373 (or 9370 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 55139742 is about 7425.6139140141. The cubic root of 55139742 is about 380.6170537948.

The spelling of 55139742 in words is "fifty-five million, one hundred thirty-nine thousand, seven hundred forty-two".