140887391 has 4 divisors (see below), whose sum is σ = 140911152. Its totient is φ = 140863632.

The previous prime is 140887387. The next prime is 140887429. The reversal of 140887391 is 193788041.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 140887391 - 2² = 140887387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140887301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5195 + ... + 17571.

It is an arithmetic number, because the mean of its divisors is an integer number (35227788).

Almost surely, 2^140887391 is an apocalyptic number.

140887391 is a deficient number, since it is larger than the sum of its proper divisors (23761).

140887391 is a wasteful number, since it uses less digits than its factorization.

140887391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23760.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 140887391 is about 11869.5994456426. The cubic root of 140887391 is about 520.3441890435.

The spelling of 140887391 in words is "one hundred forty million, eight hundred eighty-seven thousand, three hundred ninety-one".