125406821 has 8 divisors (see below), whose sum is σ = 132820320. Its totient is φ = 118074672.

The previous prime is 125406793. The next prime is 125406871. The reversal of 125406821 is 128604521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125406821 - 2¹⁴ = 125390437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125406871) 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, 17150 + ... + 23343.

It is an arithmetic number, because the mean of its divisors is an integer number (16602540).

Almost surely, 2^125406821 is an apocalyptic number.

It is an amenable number.

125406821 is a deficient number, since it is larger than the sum of its proper divisors (7413499).

125406821 is a wasteful number, since it uses less digits than its factorization.

125406821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40675.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 125406821 is about 11198.5186966848. The cubic root of 125406821 is about 500.5418406054.

The spelling of 125406821 in words is "one hundred twenty-five million, four hundred six thousand, eight hundred twenty-one".