145721838 has 8 divisors (see below), whose sum is σ = 291443688. Its totient is φ = 48573944.

The previous prime is 145721819. The next prime is 145721843. The reversal of 145721838 is 838127541.

It is a sphenic number, since it is the product of 3 distinct primes.

145721838 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 145721796 and 145721805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12143481 + ... + 12143492.

It is an arithmetic number, because the mean of its divisors is an integer number (36430461).

Almost surely, 2^145721838 is an apocalyptic number.

145721838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

145721838 is a wasteful number, since it uses less digits than its factorization.

145721838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24286978.

The product of its digits is 53760, while the sum is 39.

The square root of 145721838 is about 12071.5300604356. The cubic root of 145721838 is about 526.2291237724.

The spelling of 145721838 in words is "one hundred forty-five million, seven hundred twenty-one thousand, eight hundred thirty-eight".