133406731 has 8 divisors (see below), whose sum is σ = 134464320. Its totient is φ = 132352968.

The previous prime is 133406723. The next prime is 133406737. The reversal of 133406731 is 137604331.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 133406731 - 2³ = 133406723 is a prime.

It is a super-2 number, since 2×133406731² = 35594711752212722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133406731.

It is not an unprimeable number, because it can be changed into a prime (133406737) 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, 140400 + ... + 141346.

It is an arithmetic number, because the mean of its divisors is an integer number (16808040).

Almost surely, 2^133406731 is an apocalyptic number.

133406731 is a deficient number, since it is larger than the sum of its proper divisors (1057589).

133406731 is an equidigital number, since it uses as much as digits as its factorization.

133406731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 133406731 is about 11550.1831587209. The cubic root of 133406731 is about 510.9666799403.

The spelling of 133406731 in words is "one hundred thirty-three million, four hundred six thousand, seven hundred thirty-one".