1971738 has 12 divisors (see below), whose sum is σ = 4272138. Its totient is φ = 657240.

The previous prime is 1971727. The next prime is 1971799. The reversal of 1971738 is 8371791.

It can be written as a sum of positive squares in only one way, i.e., 1912689 + 59049 = 1383^2 + 243^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54753 + ... + 54788.

2^1971738 is an apocalyptic number.

1971738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1971738 is an abundant number, since it is smaller than the sum of its proper divisors (2300400).

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

1971738 is a wasteful number, since it uses less digits than its factorization.

1971738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109549 (or 109546 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 1971738 is about 1404.1858851306. The cubic root of 1971738 is about 125.3958226060.

The spelling of 1971738 in words is "one million, nine hundred seventy-one thousand, seven hundred thirty-eight".