1667427399 has 24 divisors (see below), whose sum is σ = 2628916992. Its totient is φ = 1010002320.

The previous prime is 1667427397. The next prime is 1667427407. The reversal of 1667427399 is 9937247661.

It is a happy number.

1667427399 is a `hidden beast` number, since 166 + 74 + 27 + 399 = 666.

1667427399 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1667427399 - 2¹ = 1667427397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667427397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238812 + ... + 245694.

It is an arithmetic number, because the mean of its divisors is an integer number (109538208).

Almost surely, 2^1667427399 is an apocalyptic number.

1667427399 is a deficient number, since it is larger than the sum of its proper divisors (961489593).

1667427399 is a wasteful number, since it uses less digits than its factorization.

1667427399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9347 (or 9344 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The square root of 1667427399 is about 40834.1450137015. The cubic root of 1667427399 is about 1185.8114636409.

The spelling of 1667427399 in words is "one billion, six hundred sixty-seven million, four hundred twenty-seven thousand, three hundred ninety-nine".