129540465 has 40 divisors (see below), whose sum is σ = 233176680. Its totient is φ = 68802048.

The previous prime is 129540457. The next prime is 129540473. The reversal of 129540465 is 564045921.

It is an interprime number because it is at equal distance from previous prime (129540457) and next prime (129540473).

It can be written as a sum of positive squares in 4 ways, for example, as 331776 + 129208689 = 576^2 + 11367^2 .

It is not a de Polignac number, because 129540465 - 2³ = 129540457 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 127881 + ... + 128889.

It is an arithmetic number, because the mean of its divisors is an integer number (5829417).

Almost surely, 2^129540465 is an apocalyptic number.

129540465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129540465 is a deficient number, since it is larger than the sum of its proper divisors (103636215).

129540465 is a wasteful number, since it uses less digits than its factorization.

129540465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343 (or 1334 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 129540465 is about 11381.5844679025. The cubic root of 129540465 is about 505.9820969362.

The spelling of 129540465 in words is "one hundred twenty-nine million, five hundred forty thousand, four hundred sixty-five".