1954780049 has 4 divisors (see below), whose sum is σ = 1959938160. Its totient is φ = 1949621940.

The previous prime is 1954780033. The next prime is 1954780073. The reversal of 1954780049 is 9400874591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1954780049 - 2⁴ = 1954780033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1954779985 and 1954780012.

It is not an unprimeable number, because it can be changed into a prime (1954780099) 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, 2578487 + ... + 2579244.

It is an arithmetic number, because the mean of its divisors is an integer number (489984540).

Almost surely, 2^1954780049 is an apocalyptic number.

It is an amenable number.

1954780049 is a deficient number, since it is larger than the sum of its proper divisors (5158111).

1954780049 is an equidigital number, since it uses as much as digits as its factorization.

1954780049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5158110.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1954780049 is about 44212.8946010098. The cubic root of 1954780049 is about 1250.3529774362.

The spelling of 1954780049 in words is "one billion, nine hundred fifty-four million, seven hundred eighty thousand, forty-nine".