140636405 has 16 divisors (see below), whose sum is σ = 207709824. Its totient is φ = 89017920.

The previous prime is 140636389. The next prime is 140636407. The reversal of 140636405 is 504636041.

It is a happy number.

140636405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 140636405 - 2⁴ = 140636389 is a prime.

It is a super-2 number, since 2×140636405² = 39557196822648050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140636407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154091 + ... + 155000.

It is an arithmetic number, because the mean of its divisors is an integer number (12981864).

Almost surely, 2^140636405 is an apocalyptic number.

It is an amenable number.

140636405 is a deficient number, since it is larger than the sum of its proper divisors (67073419).

140636405 is a wasteful number, since it uses less digits than its factorization.

140636405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309116.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 140636405 is about 11859.0220929046. The cubic root of 140636405 is about 520.0350136680.

The spelling of 140636405 in words is "one hundred forty million, six hundred thirty-six thousand, four hundred five".