1944402077 has 4 divisors (see below), whose sum is σ = 1947554076. Its totient is φ = 1941250080.

The previous prime is 1944402071. The next prime is 1944402101. The reversal of 1944402077 is 7702044491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7702044491 = 281 ⋅27409411.

It can be written as a sum of positive squares in 2 ways, for example, as 344882041 + 1599520036 = 18571^2 + 39994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1944402077 - 2²⁰ = 1943353501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1944402077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1944402071) 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, 1575074 + ... + 1576307.

It is an arithmetic number, because the mean of its divisors is an integer number (486888519).

Almost surely, 2^1944402077 is an apocalyptic number.

It is an amenable number.

1944402077 is a deficient number, since it is larger than the sum of its proper divisors (3151999).

1944402077 is an equidigital number, since it uses as much as digits as its factorization.

1944402077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151998.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 1944402077 is about 44095.3747801286. The cubic root of 1944402077 is about 1248.1363325358.

The spelling of 1944402077 in words is "one billion, nine hundred forty-four million, four hundred two thousand, seventy-seven".