1372409 has 4 divisors (see below), whose sum is σ = 1380516. Its totient is φ = 1364304.

The previous prime is 1372403. The next prime is 1372411. The reversal of 1372409 is 9042731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9042731 = 31 ⋅291701.

It can be written as a sum of positive squares in 2 ways, for example, as 861184 + 511225 = 928^2 + 715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1372409 - 2¹⁶ = 1306873 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1372403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3794 + ... + 4139.

It is an arithmetic number, because the mean of its divisors is an integer number (345129).

2^1372409 is an apocalyptic number.

It is an amenable number.

1372409 is a deficient number, since it is larger than the sum of its proper divisors (8107).

1372409 is an equidigital number, since it uses as much as digits as its factorization.

1372409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1372409 is about 1171.4986128886. The cubic root of 1372409 is about 111.1291141569.

It can be divided in two parts, 137 and 2409, that multiplied together give a palindrome (330033).

The spelling of 1372409 in words is "one million, three hundred seventy-two thousand, four hundred nine".