133451920 has 40 divisors (see below), whose sum is σ = 354602304. Its totient is φ = 45754752.

The previous prime is 133451909. The next prime is 133451951. The reversal of 133451920 is 29154331.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118594 + ... + 119713.

Almost surely, 2^133451920 is an apocalyptic number.

133451920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133451920 is an abundant number, since it is smaller than the sum of its proper divisors (221150384).

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

133451920 is a wasteful number, since it uses less digits than its factorization.

133451920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238327 (or 238321 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 133451920 is about 11552.1391958373. The cubic root of 133451920 is about 511.0243668514.

The spelling of 133451920 in words is "one hundred thirty-three million, four hundred fifty-one thousand, nine hundred twenty".