140721725 has 24 divisors (see below), whose sum is σ = 178042920. Its totient is φ = 110315520.

The previous prime is 140721719. The next prime is 140721743. The reversal of 140721725 is 527127041.

140721725 = 311² + 312² + ... + 767².

It can be written as a sum of positive squares in 12 ways, for example, as 39075001 + 101646724 = 6251^2 + 10082^2 .

It is not a de Polignac number, because 140721725 - 2¹⁶ = 140656189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307697 + ... + 308153.

It is an arithmetic number, because the mean of its divisors is an integer number (7418455).

Almost surely, 2^140721725 is an apocalyptic number.

It is an amenable number.

140721725 is a deficient number, since it is larger than the sum of its proper divisors (37321195).

140721725 is a wasteful number, since it uses less digits than its factorization.

140721725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 140721725 is about 11862.6188086780. The cubic root of 140721725 is about 520.1401557608.

Adding to 140721725 its reverse (527127041), we get a palindrome (667848766).

It can be divided in two parts, 1407 and 21725, that added together give a palindrome (23132).

The spelling of 140721725 in words is "one hundred forty million, seven hundred twenty-one thousand, seven hundred twenty-five".