1920013229 has 4 divisors (see below), whose sum is σ = 1921122876. Its totient is φ = 1918903584.

The previous prime is 1920013219. The next prime is 1920013273. The reversal of 1920013229 is 9223100291.

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

It can be written as a sum of positive squares in 2 ways, for example, as 984265129 + 935748100 = 31373^2 + 30590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920013229 - 2⁸ = 1920012973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920013219) 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, 552224 + ... + 555689.

It is an arithmetic number, because the mean of its divisors is an integer number (480280719).

Almost surely, 2^1920013229 is an apocalyptic number.

It is an amenable number.

1920013229 is a deficient number, since it is larger than the sum of its proper divisors (1109647).

1920013229 is a wasteful number, since it uses less digits than its factorization.

1920013229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109646.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1920013229 is about 43817.9555547723. The cubic root of 1920013229 is about 1242.8958569291.

The spelling of 1920013229 in words is "one billion, nine hundred twenty million, thirteen thousand, two hundred twenty-nine".