1972738 has 4 divisors (see below), whose sum is σ = 2959110. Its totient is φ = 986368.

The previous prime is 1972721. The next prime is 1972739. The reversal of 1972738 is 8372791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1830609 + 142129 = 1353^2 + 377^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1972697 and 1972706.

It is not an unprimeable number, because it can be changed into a prime (1972739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493183 + ... + 493186.

2^1972738 is an apocalyptic number.

1972738 is a deficient number, since it is larger than the sum of its proper divisors (986372).

1972738 is an equidigital number, since it uses as much as digits as its factorization.

1972738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986371.

The product of its digits is 21168, while the sum is 37.

The square root of 1972738 is about 1404.5419182068. The cubic root of 1972738 is about 125.4170178882.

The spelling of 1972738 in words is "one million, nine hundred seventy-two thousand, seven hundred thirty-eight".