1020408389 has 48 divisors (see below), whose sum is σ = 1408591296. Its totient is φ = 726566400.

The previous prime is 1020408383. The next prime is 1020408437. The reversal of 1020408389 is 9838040201.

It is a happy number.

It is not a de Polignac number, because 1020408389 - 2²⁴ = 1003631173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020408383) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 749069 + ... + 750429.

It is an arithmetic number, because the mean of its divisors is an integer number (29345652).

Almost surely, 2^1020408389 is an apocalyptic number.

It is an amenable number.

1020408389 is a deficient number, since it is larger than the sum of its proper divisors (388182907).

1020408389 is a wasteful number, since it uses less digits than its factorization.

1020408389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506 (or 1499 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1020408389 is about 31943.8317833036. The cubic root of 1020408389 is about 1006.7570359618.

The spelling of 1020408389 in words is "one billion, twenty million, four hundred eight thousand, three hundred eighty-nine".