1640167742 has 16 divisors (see below), whose sum is σ = 2644842240. Its totient is φ = 760390488.

The previous prime is 1640167741. The next prime is 1640167757. The reversal of 1640167742 is 2477610461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 1640167696 and 1640167705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640167741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 457388 + ... + 460959.

It is an arithmetic number, because the mean of its divisors is an integer number (165302640).

Almost surely, 2^1640167742 is an apocalyptic number.

1640167742 is a deficient number, since it is larger than the sum of its proper divisors (1004674498).

1640167742 is a wasteful number, since it uses less digits than its factorization.

1640167742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918415.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 1640167742 is about 40498.9844564033. The cubic root of 1640167742 is about 1179.3139126661.

The spelling of 1640167742 in words is "one billion, six hundred forty million, one hundred sixty-seven thousand, seven hundred forty-two".