1597421943 has 12 divisors (see below), whose sum is σ = 2484878760. Its totient is φ = 983028816.

The previous prime is 1597421933. The next prime is 1597421957. The reversal of 1597421943 is 3491247951.

1597421943 is a `hidden beast` number, since 1 + 597 + 4 + 2 + 19 + 43 = 666.

It is not a de Polignac number, because 1597421943 - 2⁵ = 1597421911 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1597421933) 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, 6826473 + ... + 6826706.

It is an arithmetic number, because the mean of its divisors is an integer number (207073230).

Almost surely, 2^1597421943 is an apocalyptic number.

1597421943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1597421943 is a deficient number, since it is larger than the sum of its proper divisors (887456817).

1597421943 is a wasteful number, since it uses less digits than its factorization.

1597421943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13653198 (or 13653195 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1597421943 is about 39967.7612958244. The cubic root of 1597421943 is about 1168.9785672183.

The spelling of 1597421943 in words is "one billion, five hundred ninety-seven million, four hundred twenty-one thousand, nine hundred forty-three".