1945397538 has 48 divisors (see below), whose sum is σ = 4819763520. Its totient is φ = 555529248.

The previous prime is 1945397527. The next prime is 1945397599. The reversal of 1945397538 is 8357935491.

1945397538 is a `hidden beast` number, since 1 + 9 + 4 + 539 + 75 + 38 = 666.

1945397538 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1945397538² = 7569143161712922888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 352456 + ... + 357932.

It is an arithmetic number, because the mean of its divisors is an integer number (100411740).

Almost surely, 2^1945397538 is an apocalyptic number.

1945397538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1945397538 is an abundant number, since it is smaller than the sum of its proper divisors (2874365982).

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

1945397538 is a wasteful number, since it uses less digits than its factorization.

1945397538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8311 (or 8308 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 54.

The square root of 1945397538 is about 44106.6609255337. The cubic root of 1945397538 is about 1248.3492958736.

The spelling of 1945397538 in words is "one billion, nine hundred forty-five million, three hundred ninety-seven thousand, five hundred thirty-eight".