140021407 has 2 divisors, whose sum is σ = 140021408. Its totient is φ = 140021406.

The previous prime is 140021383. The next prime is 140021411. The reversal of 140021407 is 704120041.

140021407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140021407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140021467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70010703 + 70010704.

It is an arithmetic number, because the mean of its divisors is an integer number (70010704).

Almost surely, 2^140021407 is an apocalyptic number.

140021407 is a deficient number, since it is larger than the sum of its proper divisors (1).

140021407 is an equidigital number, since it uses as much as digits as its factorization.

140021407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 140021407 is about 11833.0641424781. The cubic root of 140021407 is about 519.2758744842.

Adding to 140021407 its reverse (704120041), we get a palindrome (844141448).

The spelling of 140021407 in words is "one hundred forty million, twenty-one thousand, four hundred seven".