1997427 has 8 divisors (see below), whose sum is σ = 2693520. Its totient is φ = 1316480.

The previous prime is 1997419. The next prime is 1997431. The reversal of 1997427 is 7247991.

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

It is a cyclic number.

It is not a de Polignac number, because 1997427 - 2³ = 1997419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1997407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3474 + ... + 4007.

It is an arithmetic number, because the mean of its divisors is an integer number (336690).

2^1997427 is an apocalyptic number.

1997427 is a deficient number, since it is larger than the sum of its proper divisors (696093).

1997427 is an equidigital number, since it uses as much as digits as its factorization.

1997427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7573.

The product of its digits is 31752, while the sum is 39.

The square root of 1997427 is about 1413.3035767308. The cubic root of 1997427 is about 125.9380521889.

It can be divided in two parts, 199 and 7427, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 1997427 in words is "one million, nine hundred ninety-seven thousand, four hundred twenty-seven".