900140509 has 4 divisors (see below), whose sum is σ = 906616480. Its totient is φ = 893664540.

The previous prime is 900140491. The next prime is 900140513. The reversal of 900140509 is 905041009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 905041009 = 379 ⋅2387971.

It is a cyclic number.

It is not a de Polignac number, because 900140509 - 2⁹ = 900139997 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 (900140519) 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, 3237777 + ... + 3238054.

It is an arithmetic number, because the mean of its divisors is an integer number (226654120).

Almost surely, 2^900140509 is an apocalyptic number.

It is an amenable number.

900140509 is a deficient number, since it is larger than the sum of its proper divisors (6475971).

900140509 is a wasteful number, since it uses less digits than its factorization.

900140509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6475970.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 900140509 is about 30002.3417252720. The cubic root of 900140509 is about 965.5396264163.

The spelling of 900140509 in words is "nine hundred million, one hundred forty thousand, five hundred nine".