146346721 has 4 divisors (see below), whose sum is σ = 154049200. Its totient is φ = 138644244.

The previous prime is 146346661. The next prime is 146346749. The reversal of 146346721 is 127643641.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127643641 = 2179 ⋅58579.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146346721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146346751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3851211 + ... + 3851248.

It is an arithmetic number, because the mean of its divisors is an integer number (38512300).

Almost surely, 2^146346721 is an apocalyptic number.

It is an amenable number.

146346721 is a deficient number, since it is larger than the sum of its proper divisors (7702479).

146346721 is an equidigital number, since it uses as much as digits as its factorization.

146346721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7702478.

The product of its digits is 24192, while the sum is 34.

The square root of 146346721 is about 12097.3848826926. The cubic root of 146346721 is about 526.9802413897.

It can be divided in two parts, 1463 and 46721, that added together give a palindrome (48184).

The spelling of 146346721 in words is "one hundred forty-six million, three hundred forty-six thousand, seven hundred twenty-one".