1520006399 has 4 divisors (see below), whose sum is σ = 1520156880. Its totient is φ = 1519855920.

The previous prime is 1520006387. The next prime is 1520006401. The reversal of 1520006399 is 9936000251.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1520006399 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 (1520006309) 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, 58907 + ... + 80684.

It is an arithmetic number, because the mean of its divisors is an integer number (380039220).

Almost surely, 2^1520006399 is an apocalyptic number.

1520006399 is a deficient number, since it is larger than the sum of its proper divisors (150481).

1520006399 is a wasteful number, since it uses less digits than its factorization.

1520006399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150480.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 1520006399 is about 38987.2594445929. The cubic root of 1520006399 is about 1149.7810292601.

The spelling of 1520006399 in words is "one billion, five hundred twenty million, six thousand, three hundred ninety-nine".