1897887764 has 6 divisors (see below), whose sum is σ = 3321303594. Its totient is φ = 948943880.

The previous prime is 1897887737. The next prime is 1897887781. The reversal of 1897887764 is 4677887981.

It can be written as a sum of positive squares in only one way, i.e., 1185424900 + 712462864 = 34430^2 + 26692^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1897887764.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237235967 + ... + 237235974.

It is an arithmetic number, because the mean of its divisors is an integer number (553550599).

Almost surely, 2^1897887764 is an apocalyptic number.

It is an amenable number.

1897887764 is a deficient number, since it is larger than the sum of its proper divisors (1423415830).

1897887764 is a wasteful number, since it uses less digits than its factorization.

1897887764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474471945 (or 474471943 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 65.

The square root of 1897887764 is about 43564.7536891924. The cubic root of 1897887764 is about 1238.1031882274.

The spelling of 1897887764 in words is "one billion, eight hundred ninety-seven million, eight hundred eighty-seven thousand, seven hundred sixty-four".