140407921 has 2 divisors, whose sum is σ = 140407922. Its totient is φ = 140407920.

The previous prime is 140407907. The next prime is 140407951. The reversal of 140407921 is 129704041.

140407921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132365025 + 8042896 = 11505^2 + 2836^2 .

It is a cyclic number.

It is not a de Polignac number, because 140407921 - 2⁷ = 140407793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140407921.

It is not a weakly prime, because it can be changed into another prime (140407951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70203960 + 70203961.

It is an arithmetic number, because the mean of its divisors is an integer number (70203961).

Almost surely, 2^140407921 is an apocalyptic number.

It is an amenable number.

140407921 is a deficient number, since it is larger than the sum of its proper divisors (1).

140407921 is an equidigital number, since it uses as much as digits as its factorization.

140407921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 140407921 is about 11849.3848363533. The cubic root of 140407921 is about 519.7532372087.

The spelling of 140407921 in words is "one hundred forty million, four hundred seven thousand, nine hundred twenty-one".