140393531 has 4 divisors (see below), whose sum is σ = 148651992. Its totient is φ = 132135072.

The previous prime is 140393453. The next prime is 140393543. The reversal of 140393531 is 135393041.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 140393531 - 2¹⁰ = 140392507 is a prime.

It is a super-2 number, since 2×140393531² = 39420687093295922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140393494 and 140393503.

It is not an unprimeable number, because it can be changed into a prime (140393731) 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, 4129205 + ... + 4129238.

It is an arithmetic number, because the mean of its divisors is an integer number (37162998).

Almost surely, 2^140393531 is an apocalyptic number.

140393531 is a deficient number, since it is larger than the sum of its proper divisors (8258461).

140393531 is an equidigital number, since it uses as much as digits as its factorization.

140393531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8258460.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 140393531 is about 11848.7776162776. Note that the first 3 decimals coincide. The cubic root of 140393531 is about 519.7354806022.

The spelling of 140393531 in words is "one hundred forty million, three hundred ninety-three thousand, five hundred thirty-one".