148209709 has 4 divisors (see below), whose sum is σ = 156010240. Its totient is φ = 140409180.

The previous prime is 148209703. The next prime is 148209713. The reversal of 148209709 is 907902841.

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: 907902841 = 13399 ⋅67759.

It is a cyclic number.

It is not a de Polignac number, because 148209709 - 2³ = 148209701 is a prime.

It is a super-2 number, since 2×148209709² = 43932235683729362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148209701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3900237 + ... + 3900274.

It is an arithmetic number, because the mean of its divisors is an integer number (39002560).

Almost surely, 2^148209709 is an apocalyptic number.

148209709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

148209709 is a deficient number, since it is larger than the sum of its proper divisors (7800531).

148209709 is an equidigital number, since it uses as much as digits as its factorization.

148209709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7800530.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 148209709 is about 12174.1409963907. The cubic root of 148209709 is about 529.2069651608.

The spelling of 148209709 in words is "one hundred forty-eight million, two hundred nine thousand, seven hundred nine".