612138384 has 280 divisors, whose sum is σ = 2094782592. Its totient is φ = 170760960.

The previous prime is 612138377. The next prime is 612138391. The reversal of 612138384 is 483831216.

612138384 is a `hidden beast` number, since 61 + 213 + 8 + 384 = 666.

612138384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (612138377) and next prime (612138391).

It is a super-2 number, since 2×612138384² = 749426802332262912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1667769 + ... + 1668135.

Almost surely, 2^612138384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 612138384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1047391296).

612138384 is an abundant number, since it is smaller than the sum of its proper divisors (1482644208).

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

612138384 is a wasteful number, since it uses less digits than its factorization.

612138384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 396 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 612138384 is about 24741.4305164435. The cubic root of 612138384 is about 849.0824627415.

The spelling of 612138384 in words is "six hundred twelve million, one hundred thirty-eight thousand, three hundred eighty-four".