129620045 has 16 divisors (see below), whose sum is σ = 158345280. Its totient is φ = 101844864.

The previous prime is 129620039. The next prime is 129620047. The reversal of 129620045 is 540026921.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 129620045 - 2⁶ = 129619981 is a prime.

It is a super-3 number, since 3×129620045³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129620047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71642 + ... + 73428.

It is an arithmetic number, because the mean of its divisors is an integer number (9896580).

Almost surely, 2^129620045 is an apocalyptic number.

It is an amenable number.

129620045 is a deficient number, since it is larger than the sum of its proper divisors (28725235).

129620045 is a wasteful number, since it uses less digits than its factorization.

129620045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 129620045 is about 11385.0799294515. The cubic root of 129620045 is about 506.0856882801.

Adding to 129620045 its reverse (540026921), we get a palindrome (669646966).

The spelling of 129620045 in words is "one hundred twenty-nine million, six hundred twenty thousand, forty-five".