133497978 has 16 divisors (see below), whose sum is σ = 268635936. Its totient is φ = 44226000.

The previous prime is 133497967. The next prime is 133497979. The reversal of 133497978 is 879794331.

It is a self number, because there is not a number n which added to its sum of digits gives 133497978.

It is not an unprimeable number, because it can be changed into a prime (133497979) 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, 67273 + ... + 69228.

It is an arithmetic number, because the mean of its divisors is an integer number (16789746).

Almost surely, 2^133497978 is an apocalyptic number.

133497978 is an abundant number, since it is smaller than the sum of its proper divisors (135137958).

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

133497978 is a wasteful number, since it uses less digits than its factorization.

133497978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136669.

The product of its digits is 1143072, while the sum is 51.

The square root of 133497978 is about 11554.1325074624. The cubic root of 133497978 is about 511.0831497026.

The spelling of 133497978 in words is "one hundred thirty-three million, four hundred ninety-seven thousand, nine hundred seventy-eight".