1977730538 has 8 divisors (see below), whose sum is σ = 3390395232. Its totient is φ = 847598796.

The previous prime is 1977730537. The next prime is 1977730561. The reversal of 1977730538 is 8350377791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1977730538² = 7822836161875538888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1977730537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70633220 + ... + 70633247.

It is an arithmetic number, because the mean of its divisors is an integer number (423799404).

Almost surely, 2^1977730538 is an apocalyptic number.

1977730538 is a deficient number, since it is larger than the sum of its proper divisors (1412664694).

1977730538 is a wasteful number, since it uses less digits than its factorization.

1977730538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141266476.

The product of its (nonzero) digits is 1111320, while the sum is 50.

The square root of 1977730538 is about 44471.6824282599. The cubic root of 1977730538 is about 1255.2272913093.

The spelling of 1977730538 in words is "one billion, nine hundred seventy-seven million, seven hundred thirty thousand, five hundred thirty-eight".