140897921 has 16 divisors (see below), whose sum is σ = 155831040. Its totient is φ = 126792960.

The previous prime is 140897899. The next prime is 140897927. The reversal of 140897921 is 129798041.

It is a cyclic number.

It is not a de Polignac number, because 140897921 - 2⁶ = 140897857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140897927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51416 + ... + 54086.

It is an arithmetic number, because the mean of its divisors is an integer number (9739440).

Almost surely, 2^140897921 is an apocalyptic number.

It is an amenable number.

140897921 is a deficient number, since it is larger than the sum of its proper divisors (14933119).

140897921 is a wasteful number, since it uses less digits than its factorization.

140897921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 140897921 is about 11870.0430075042. The cubic root of 140897921 is about 520.3571523229.

The spelling of 140897921 in words is "one hundred forty million, eight hundred ninety-seven thousand, nine hundred twenty-one".