135723438 has 40 divisors (see below), whose sum is σ = 304824168. Its totient is φ = 45136656.

The previous prime is 135723431. The next prime is 135723443. The reversal of 135723438 is 834327531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135723431) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 105145 + ... + 106427.

Almost surely, 2^135723438 is an apocalyptic number.

135723438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

135723438 is an abundant number, since it is smaller than the sum of its proper divisors (169100730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135723438 is a wasteful number, since it uses less digits than its factorization.

135723438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950 (or 1941 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 135723438 is about 11650.0402574412. The cubic root of 135723438 is about 513.9074939380.

It can be divided in two parts, 135723 and 438, that added together give a square (136161 = 369²).

The spelling of 135723438 in words is "one hundred thirty-five million, seven hundred twenty-three thousand, four hundred thirty-eight".