135921723 has 8 divisors (see below), whose sum is σ = 207118848. Its totient is φ = 77669544.

The previous prime is 135921719. The next prime is 135921727. The reversal of 135921723 is 327129531.

It is an interprime number because it is at equal distance from previous prime (135921719) and next prime (135921727).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135921723 - 2² = 135921719 is a prime.

It is a super-3 number, since 3×135921723³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (135921727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3236211 + ... + 3236252.

It is an arithmetic number, because the mean of its divisors is an integer number (25889856).

Almost surely, 2^135921723 is an apocalyptic number.

135921723 is a deficient number, since it is larger than the sum of its proper divisors (71197125).

135921723 is an equidigital number, since it uses as much as digits as its factorization.

135921723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6472473.

The product of its digits is 11340, while the sum is 33.

The square root of 135921723 is about 11658.5472079501. The cubic root of 135921723 is about 514.1576363490.

The spelling of 135921723 in words is "one hundred thirty-five million, nine hundred twenty-one thousand, seven hundred twenty-three".