140640290 has 64 divisors (see below), whose sum is σ = 298425600. Its totient is φ = 47698560.

The previous prime is 140640287. The next prime is 140640301. The reversal of 140640290 is 92046041.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 449174 + ... + 449486.

It is an arithmetic number, because the mean of its divisors is an integer number (4662900).

Almost surely, 2^140640290 is an apocalyptic number.

140640290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

140640290 is an abundant number, since it is smaller than the sum of its proper divisors (157785310).

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

140640290 is a wasteful number, since it uses less digits than its factorization.

140640290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 140640290 is about 11859.1858911141. The cubic root of 140640290 is about 520.0398021802.

The spelling of 140640290 in words is "one hundred forty million, six hundred forty thousand, two hundred ninety".