1072720406 has 4 divisors (see below), whose sum is σ = 1609080612. Its totient is φ = 536360202.

The previous prime is 1072720403. The next prime is 1072720409. The reversal of 1072720406 is 6040272701.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6040272701 = 383 ⋅15770947.

It is an interprime number because it is at equal distance from previous prime (1072720403) and next prime (1072720409).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1072720403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268180100 + ... + 268180103.

It is an arithmetic number, because the mean of its divisors is an integer number (402270153).

Almost surely, 2^1072720406 is an apocalyptic number.

1072720406 is a deficient number, since it is larger than the sum of its proper divisors (536360206).

1072720406 is an equidigital number, since it uses as much as digits as its factorization.

1072720406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536360205.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 1072720406 is about 32752.4106899019. The cubic root of 1072720406 is about 1023.6751969488.

The spelling of 1072720406 in words is "one billion, seventy-two million, seven hundred twenty thousand, four hundred six".