1691407642 has 16 divisors (see below), whose sum is σ = 2556963360. Its totient is φ = 839104272.

The previous prime is 1691407589. The next prime is 1691407651. The reversal of 1691407642 is 2467041961.

It is a super-2 number, since 2×1691407642² = 5721719622832000328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1691407595 and 1691407604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205584 + ... + 213652.

It is an arithmetic number, because the mean of its divisors is an integer number (159810210).

Almost surely, 2^1691407642 is an apocalyptic number.

1691407642 is a deficient number, since it is larger than the sum of its proper divisors (865555718).

1691407642 is a wasteful number, since it uses less digits than its factorization.

1691407642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8877.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1691407642 is about 41126.7266142104. The cubic root of 1691407642 is about 1191.4690427842.

The spelling of 1691407642 in words is "one billion, six hundred ninety-one million, four hundred seven thousand, six hundred forty-two".