1572397 has 8 divisors (see below), whose sum is σ = 1618200. Its totient is φ = 1527360.

The previous prime is 1572379. The next prime is 1572401. The reversal of 1572397 is 7932751.

It can be written as a sum of positive squares in 4 ways, for example, as 19881 + 1552516 = 141^2 + 1246^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1572397 is a prime.

It is a Duffinian number.

1572397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1572367) 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, 9003 + ... + 9175.

It is an arithmetic number, because the mean of its divisors is an integer number (202275).

2^1572397 is an apocalyptic number.

It is an amenable number.

1572397 is a deficient number, since it is larger than the sum of its proper divisors (45803).

1572397 is a wasteful number, since it uses less digits than its factorization.

1572397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383.

The product of its digits is 13230, while the sum is 34.

The square root of 1572397 is about 1253.9525509364. The cubic root of 1572397 is about 116.2842069913.

It can be divided in two parts, 15723 and 97, that multiplied together give a triangular number (1525131 = T₁₇₄₆).

The spelling of 1572397 in words is "one million, five hundred seventy-two thousand, three hundred ninety-seven".