1538390394 has 40 divisors (see below), whose sum is σ = 3449834388. Its totient is φ = 512395200.

The previous prime is 1538390389. The next prime is 1538390431. The reversal of 1538390394 is 4930938351.

It can be written as a sum of positive squares in 2 ways, for example, as 1537659369 + 731025 = 39213^2 + 855^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 262294 + ... + 268094.

Almost surely, 2^1538390394 is an apocalyptic number.

1538390394 is an abundant number, since it is smaller than the sum of its proper divisors (1911443994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1538390394 is a wasteful number, since it uses less digits than its factorization.

1538390394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7452 (or 7443 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 1538390394 is about 39222.3200996575. The cubic root of 1538390394 is about 1154.3978780957.

The spelling of 1538390394 in words is "one billion, five hundred thirty-eight million, three hundred ninety thousand, three hundred ninety-four".