146907721 has 4 divisors (see below), whose sum is σ = 147029652. Its totient is φ = 146785792.

The previous prime is 146907713. The next prime is 146907743. The reversal of 146907721 is 127709641.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63441225 + 83466496 = 7965^2 + 9136^2 .

It is a cyclic number.

It is not a de Polignac number, because 146907721 - 2³ = 146907713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146907821) 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, 59140 + ... + 61573.

It is an arithmetic number, because the mean of its divisors is an integer number (36757413).

Almost surely, 2^146907721 is an apocalyptic number.

It is an amenable number.

146907721 is a deficient number, since it is larger than the sum of its proper divisors (121931).

146907721 is a wasteful number, since it uses less digits than its factorization.

146907721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121930.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 146907721 is about 12120.5495337464. The cubic root of 146907721 is about 527.6527515218.

The spelling of 146907721 in words is "one hundred forty-six million, nine hundred seven thousand, seven hundred twenty-one".