1978497 has 12 divisors (see below), whose sum is σ = 2870400. Its totient is φ = 1313208.

The previous prime is 1978469. The next prime is 1978507. The reversal of 1978497 is 7948791.

It is not a de Polignac number, because 1978497 - 2⁶ = 1978433 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1978297) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3004 + ... + 3602.

It is an arithmetic number, because the mean of its divisors is an integer number (239200).

2^1978497 is an apocalyptic number.

It is an amenable number.

1978497 is a deficient number, since it is larger than the sum of its proper divisors (891903).

1978497 is a wasteful number, since it uses less digits than its factorization.

1978497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972 (or 969 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 1978497 is about 1406.5905587626. The cubic root of 1978497 is about 125.5389423232.

It can be divided in two parts, 19784 and 97, that added together give a square (19881 = 141²).

The spelling of 1978497 in words is "one million, nine hundred seventy-eight thousand, four hundred ninety-seven".