146739509 has 4 divisors (see below), whose sum is σ = 167702304. Its totient is φ = 125776716.

The previous prime is 146739503. The next prime is 146739511. The reversal of 146739509 is 905937641.

146739509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 146739509 - 2⁸ = 146739253 is a prime.

It is a super-2 number, since 2×146739509² = 43064967003122162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 146739509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146739503) 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, 10481387 + ... + 10481400.

It is an arithmetic number, because the mean of its divisors is an integer number (41925576).

Almost surely, 2^146739509 is an apocalyptic number.

It is an amenable number.

146739509 is a deficient number, since it is larger than the sum of its proper divisors (20962795).

146739509 is an equidigital number, since it uses as much as digits as its factorization.

146739509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20962794.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 146739509 is about 12113.6084219361. The cubic root of 146739509 is about 527.4512839567.

The spelling of 146739509 in words is "one hundred forty-six million, seven hundred thirty-nine thousand, five hundred nine".