133811406 has 32 divisors (see below), whose sum is σ = 298334880. Its totient is φ = 44457408.

The previous prime is 133811393. The next prime is 133811417. The reversal of 133811406 is 604118331.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 133811406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13210 + ... + 21026.

It is an arithmetic number, because the mean of its divisors is an integer number (9322965).

Almost surely, 2^133811406 is an apocalyptic number.

133811406 is an abundant number, since it is smaller than the sum of its proper divisors (164523474).

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

133811406 is a wasteful number, since it uses less digits than its factorization.

133811406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8145 (or 8139 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 133811406 is about 11567.6880144651. The cubic root of 133811406 is about 511.4828126078.

Adding to 133811406 its reverse (604118331), we get a palindrome (737929737).

The spelling of 133811406 in words is "one hundred thirty-three million, eight hundred eleven thousand, four hundred six".