133139540 has 12 divisors (see below), whose sum is σ = 279593076. Its totient is φ = 53255808.

The previous prime is 133139537. The next prime is 133139543. The reversal of 133139540 is 45931331.

It is an interprime number because it is at equal distance from previous prime (133139537) and next prime (133139543).

It can be written as a sum of positive squares in 2 ways, for example, as 40094224 + 93045316 = 6332^2 + 9646^2 .

It is a super-2 number, since 2×133139540² = 35452274222823200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133139543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3328469 + ... + 3328508.

It is an arithmetic number, because the mean of its divisors is an integer number (23299423).

Almost surely, 2^133139540 is an apocalyptic number.

133139540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133139540 is an abundant number, since it is smaller than the sum of its proper divisors (146453536).

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

133139540 is a wasteful number, since it uses less digits than its factorization.

133139540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656986 (or 6656984 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 133139540 is about 11538.6108349316. The cubic root of 133139540 is about 510.6253254858.

The spelling of 133139540 in words is "one hundred thirty-three million, one hundred thirty-nine thousand, five hundred forty".