1642897975 has 12 divisors (see below), whose sum is σ = 2075632776. Its totient is φ = 1289518880.

The previous prime is 1642897973. The next prime is 1642897987. The reversal of 1642897975 is 5797982461.

It is not a de Polignac number, because 1642897975 - 2¹ = 1642897973 is a prime.

It is a super-2 number, since 2×1642897975² = 5398227512518201250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642897973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 618637 + ... + 621286.

It is an arithmetic number, because the mean of its divisors is an integer number (172969398).

Almost surely, 2^1642897975 is an apocalyptic number.

1642897975 is a deficient number, since it is larger than the sum of its proper divisors (432734801).

1642897975 is a wasteful number, since it uses less digits than its factorization.

1642897975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239986 (or 1239981 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 58.

The square root of 1642897975 is about 40532.6778661366. The cubic root of 1642897975 is about 1179.9679142382.

The spelling of 1642897975 in words is "one billion, six hundred forty-two million, eight hundred ninety-seven thousand, nine hundred seventy-five".