55139700 has 324 divisors, whose sum is σ = 210569856. Its totient is φ = 11088000.

The previous prime is 55139681. The next prime is 55139719. The reversal of 55139700 is 793155.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55139681) and next prime (55139719).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1778685 + ... + 1778715.

Almost surely, 2^55139700 is an apocalyptic number.

55139700 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55139700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105284928).

55139700 is an abundant number, since it is smaller than the sum of its proper divisors (155430156).

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

55139700 is a wasteful number, since it uses less digits than its factorization.

55139700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 4725, while the sum is 30.

The square root of 55139700 is about 7425.6110859646. The cubic root of 55139700 is about 380.6169571560.

The spelling of 55139700 in words is "fifty-five million, one hundred thirty-nine thousand, seven hundred".