1897421744 has 20 divisors (see below), whose sum is σ = 3803022960. Its totient is φ = 915996480.

The previous prime is 1897421723. The next prime is 1897421761. The reversal of 1897421744 is 4471247981.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2044172 + ... + 2045099.

It is an arithmetic number, because the mean of its divisors is an integer number (190151148).

Almost surely, 2^1897421744 is an apocalyptic number.

It is an amenable number.

1897421744 is an abundant number, since it is smaller than the sum of its proper divisors (1905601216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1897421744 is a wasteful number, since it uses less digits than its factorization.

1897421744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089308 (or 4089302 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 1897421744 is about 43559.4047709562. The cubic root of 1897421744 is about 1238.0018425647.

The spelling of 1897421744 in words is "one billion, eight hundred ninety-seven million, four hundred twenty-one thousand, seven hundred forty-four".