133688390 has 16 divisors (see below), whose sum is σ = 262515600. Its totient is φ = 48613920.

The previous prime is 133688381. The next prime is 133688431. The reversal of 133688390 is 93886331.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 607565 + ... + 607784.

It is an arithmetic number, because the mean of its divisors is an integer number (16407225).

Almost surely, 2^133688390 is an apocalyptic number.

133688390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133688390 is a deficient number, since it is larger than the sum of its proper divisors (128827210).

133688390 is a wasteful number, since it uses less digits than its factorization.

133688390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215367.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 133688390 is about 11562.3695668319. The cubic root of 133688390 is about 511.3260251239.

The spelling of 133688390 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, three hundred ninety".