146721636 has 54 divisors (see below), whose sum is σ = 383319846. Its totient is φ = 47318400.

The previous prime is 146721599. The next prime is 146721647. The reversal of 146721636 is 636127641.

It is a happy number.

146721636 is a `hidden beast` number, since 14 + 6 + 7 + 2 + 1 + 636 = 666.

It can be written as a sum of positive squares in only one way, i.e., 146168100 + 553536 = 12090^2 + 744^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 146721636.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 32476 + ... + 36716.

Almost surely, 2^146721636 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 146721636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191659923).

146721636 is an abundant number, since it is smaller than the sum of its proper divisors (236598210).

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

146721636 is a wasteful number, since it uses less digits than its factorization.

146721636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4313 (or 4277 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 146721636 is about 12112.8706754427. The cubic root of 146721636 is about 527.4298684120.

The spelling of 146721636 in words is "one hundred forty-six million, seven hundred twenty-one thousand, six hundred thirty-six".