1772140391 has 4 divisors (see below), whose sum is σ = 2025303312. Its totient is φ = 1518977472.

The previous prime is 1772140369. The next prime is 1772140397. The reversal of 1772140391 is 1930412771.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1772140391 - 2¹⁸ = 1771878247 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 (1772140397) 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 in 3 ways as a sum of consecutive naturals, for example, 126581450 + ... + 126581463.

It is an arithmetic number, because the mean of its divisors is an integer number (506325828).

Almost surely, 2^1772140391 is an apocalyptic number.

1772140391 is a deficient number, since it is larger than the sum of its proper divisors (253162921).

1772140391 is an equidigital number, since it uses as much as digits as its factorization.

1772140391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253162920.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 1772140391 is about 42096.7978710970. The cubic root of 1772140391 is about 1210.1318962384.

The spelling of 1772140391 in words is "one billion, seven hundred seventy-two million, one hundred forty thousand, three hundred ninety-one".