140991906 has 64 divisors (see below), whose sum is σ = 320495616. Its totient is φ = 40963200.

The previous prime is 140991901. The next prime is 140991911. The reversal of 140991906 is 609199041.

140991906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (140991901) and next prime (140991911).

It is not an unprimeable number, because it can be changed into a prime (140991901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 280051 + ... + 280553.

It is an arithmetic number, because the mean of its divisors is an integer number (5007744).

Almost surely, 2^140991906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 140991906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160247808).

140991906 is an abundant number, since it is smaller than the sum of its proper divisors (179503710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

140991906 is a wasteful number, since it uses less digits than its factorization.

140991906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 140991906 is about 11874.0012632642. The cubic root of 140991906 is about 520.4728268399.

The spelling of 140991906 in words is "one hundred forty million, nine hundred ninety-one thousand, nine hundred six".