1670405387 has 16 divisors (see below), whose sum is σ = 2011987200. Its totient is φ = 1354747680.

The previous prime is 1670405377. The next prime is 1670405413. The reversal of 1670405387 is 7835040761.

It is a cyclic number.

It is not a de Polignac number, because 1670405387 - 2⁶ = 1670405323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1670405327) 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, 106937 + ... + 121557.

It is an arithmetic number, because the mean of its divisors is an integer number (125749200).

Almost surely, 2^1670405387 is an apocalyptic number.

1670405387 is a deficient number, since it is larger than the sum of its proper divisors (341581813).

1670405387 is a wasteful number, since it uses less digits than its factorization.

1670405387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15506.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 1670405387 is about 40870.5931814061. The cubic root of 1670405387 is about 1186.5169880315.

The spelling of 1670405387 in words is "one billion, six hundred seventy million, four hundred five thousand, three hundred eighty-seven".