125440805 has 32 divisors (see below), whose sum is σ = 180230400. Its totient is φ = 81994752.

The previous prime is 125440801. The next prime is 125440811. The reversal of 125440805 is 508044521.

It is not a de Polignac number, because 125440805 - 2² = 125440801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125440801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83501 + ... + 84989.

It is an arithmetic number, because the mean of its divisors is an integer number (5632200).

Almost surely, 2^125440805 is an apocalyptic number.

It is an amenable number.

125440805 is a deficient number, since it is larger than the sum of its proper divisors (54789595).

125440805 is a wasteful number, since it uses less digits than its factorization.

125440805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 125440805 is about 11200.0359374423. The cubic root of 125440805 is about 500.5870504737.

The spelling of 125440805 in words is "one hundred twenty-five million, four hundred forty thousand, eight hundred five".