133939690 has 16 divisors (see below), whose sum is σ = 249405480. Its totient is φ = 51728320.

The previous prime is 133939679. The next prime is 133939693. The reversal of 133939690 is 96939331.

It can be written as a sum of positive squares in 4 ways, for example, as 78481881 + 55457809 = 8859^2 + 7447^2 .

It is a super-2 number, since 2×133939690² = 35879681114592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133939693) 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, 230641 + ... + 231220.

Almost surely, 2^133939690 is an apocalyptic number.

133939690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133939690 is a deficient number, since it is larger than the sum of its proper divisors (115465790).

133939690 is a wasteful number, since it uses less digits than its factorization.

133939690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461897.

The product of its (nonzero) digits is 118098, while the sum is 43.

The square root of 133939690 is about 11573.2316143763. The cubic root of 133939690 is about 511.6462119921.

The spelling of 133939690 in words is "one hundred thirty-three million, nine hundred thirty-nine thousand, six hundred ninety".