1945487638 has 16 divisors (see below), whose sum is σ = 3053018304. Its totient is φ = 928824640.

The previous prime is 1945487627. The next prime is 1945487651. The reversal of 1945487638 is 8367845491.

It is a super-2 number, since 2×1945487638² = 7569844299221638088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248545 + ... + 256252.

It is an arithmetic number, because the mean of its divisors is an integer number (190813644).

Almost surely, 2^1945487638 is an apocalyptic number.

1945487638 is a deficient number, since it is larger than the sum of its proper divisors (1107530666).

1945487638 is a wasteful number, since it uses less digits than its factorization.

1945487638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504887.

The product of its digits is 5806080, while the sum is 55.

The square root of 1945487638 is about 44107.6823013860. The cubic root of 1945487638 is about 1248.3685677761.

The spelling of 1945487638 in words is "one billion, nine hundred forty-five million, four hundred eighty-seven thousand, six hundred thirty-eight".