1921457079 has 16 divisors (see below), whose sum is σ = 3014051040. Its totient is φ = 1205619840.

The previous prime is 1921457009. The next prime is 1921457093. The reversal of 1921457079 is 9707541291.

1921457079 is a `hidden beast` number, since 1 + 9 + 2 + 1 + 4 + 570 + 79 = 666.

It is not a de Polignac number, because 1921457079 - 2⁷ = 1921456951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921457009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2092632 + ... + 2093549.

It is an arithmetic number, because the mean of its divisors is an integer number (188378190).

Almost surely, 2^1921457079 is an apocalyptic number.

1921457079 is a deficient number, since it is larger than the sum of its proper divisors (1092593961).

1921457079 is a wasteful number, since it uses less digits than its factorization.

1921457079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4186207 (or 4186201 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 1921457079 is about 43834.4280104121. The cubic root of 1921457079 is about 1243.2073314385.

The spelling of 1921457079 in words is "one billion, nine hundred twenty-one million, four hundred fifty-seven thousand, seventy-nine".