140620905 has 24 divisors (see below), whose sum is σ = 250333512. Its totient is φ = 72969984.

The previous prime is 140620903. The next prime is 140620969. The reversal of 140620905 is 509026041.

It can be written as a sum of positive squares in 4 ways, for example, as 47941776 + 92679129 = 6924^2 + 9627^2 .

It is not a de Polignac number, because 140620905 - 2¹ = 140620903 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140620903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40564 + ... + 43893.

It is an arithmetic number, because the mean of its divisors is an integer number (10430563).

Almost surely, 2^140620905 is an apocalyptic number.

140620905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

140620905 is a deficient number, since it is larger than the sum of its proper divisors (109712607).

140620905 is a wasteful number, since it uses less digits than its factorization.

140620905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84505 (or 84502 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 140620905 is about 11858.3685640142. The cubic root of 140620905 is about 520.0159080439.

Adding to 140620905 its reverse (509026041), we get a palindrome (649646946).

The spelling of 140620905 in words is "one hundred forty million, six hundred twenty thousand, nine hundred five".