125440721 has 8 divisors (see below), whose sum is σ = 143774400. Its totient is φ = 107210448.

The previous prime is 125440699. The next prime is 125440723. The reversal of 125440721 is 127044521.

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 125440721 - 2⁶ = 125440657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125440723) 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, 23231 + ... + 28116.

It is an arithmetic number, because the mean of its divisors is an integer number (17971800).

Almost surely, 2^125440721 is an apocalyptic number.

It is an amenable number.

125440721 is a deficient number, since it is larger than the sum of its proper divisors (18333679).

125440721 is an equidigital number, since it uses as much as digits as its factorization.

125440721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51703.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 125440721 is about 11200.0321874537. The cubic root of 125440721 is about 500.5869387362.

The spelling of 125440721 in words is "one hundred twenty-five million, four hundred forty thousand, seven hundred twenty-one".