902020309 has 4 divisors (see below), whose sum is σ = 902401216. Its totient is φ = 901639404.

The previous prime is 902020291. The next prime is 902020319. The reversal of 902020309 is 903020209.

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.

It is a cyclic number.

It is not a de Polignac number, because 902020309 - 2⁷ = 902020181 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 (902020319) 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, 186879 + ... + 191644.

It is an arithmetic number, because the mean of its divisors is an integer number (225600304).

Almost surely, 2^902020309 is an apocalyptic number.

It is an amenable number.

902020309 is a deficient number, since it is larger than the sum of its proper divisors (380907).

902020309 is a wasteful number, since it uses less digits than its factorization.

902020309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380906.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 902020309 is about 30033.6529413257. The cubic root of 902020309 is about 966.2112842943.

The spelling of 902020309 in words is "nine hundred two million, twenty thousand, three hundred nine".