402290389 has 8 divisors (see below), whose sum is σ = 405833472. Its totient is φ = 398754720.

The previous prime is 402290377. The next prime is 402290411. The reversal of 402290389 is 983092204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402290389 - 2¹³ = 402282197 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 (402290089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186652 + ... + 188794.

It is an arithmetic number, because the mean of its divisors is an integer number (50729184).

Almost surely, 2^402290389 is an apocalyptic number.

It is an amenable number.

402290389 is a deficient number, since it is larger than the sum of its proper divisors (3543083).

402290389 is a wasteful number, since it uses less digits than its factorization.

402290389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3707.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 402290389 is about 20057.1779919310. The cubic root of 402290389 is about 738.2099349384.

The spelling of 402290389 in words is "four hundred two million, two hundred ninety thousand, three hundred eighty-nine".