133978415 has 4 divisors (see below), whose sum is σ = 160774104. Its totient is φ = 107182728.

The previous prime is 133978393. The next prime is 133978421. The reversal of 133978415 is 514879331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 514879331 = 1223 ⋅420997.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133978415 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13397837 + ... + 13397846.

It is an arithmetic number, because the mean of its divisors is an integer number (40193526).

Almost surely, 2^133978415 is an apocalyptic number.

133978415 is a deficient number, since it is larger than the sum of its proper divisors (26795689).

133978415 is an equidigital number, since it uses as much as digits as its factorization.

133978415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26795688.

The product of its digits is 90720, while the sum is 41.

The square root of 133978415 is about 11574.9045352435. The cubic root of 133978415 is about 511.6955167460.

It can be divided in two parts, 13397 and 8415, that added together give a palindrome (21812).

The spelling of 133978415 in words is "one hundred thirty-three million, nine hundred seventy-eight thousand, four hundred fifteen".