1772991138 has 16 divisors (see below), whose sum is σ = 3546781056. Its totient is φ = 590863920.

The previous prime is 1772991089. The next prime is 1772991151. The reversal of 1772991138 is 8311992771.

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, 2193 + ... + 59588.

It is an arithmetic number, because the mean of its divisors is an integer number (221673816).

Almost surely, 2^1772991138 is an apocalyptic number.

1772991138 is an abundant number, since it is smaller than the sum of its proper divisors (1773789918).

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

1772991138 is a wasteful number, since it uses less digits than its factorization.

1772991138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66569.

The product of its digits is 190512, while the sum is 48.

The square root of 1772991138 is about 42106.9013108303. The cubic root of 1772991138 is about 1210.3255135883.

The spelling of 1772991138 in words is "one billion, seven hundred seventy-two million, nine hundred ninety-one thousand, one hundred thirty-eight".