1897236720 has 120 divisors (see below), whose sum is σ = 6746394096. Its totient is φ = 476166144.

The previous prime is 1897236661. The next prime is 1897236721. The reversal of 1897236720 is 276327981.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897236721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65262 + ... + 89741.

Almost surely, 2^1897236720 is an apocalyptic number.

1897236720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897236720 is an abundant number, since it is smaller than the sum of its proper divisors (4849157376).

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

1897236720 is a wasteful number, since it uses less digits than its factorization.

1897236720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155039 (or 155030 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 1897236720 is about 43557.2809068702. The cubic root of 1897236720 is about 1237.9616006769.

The spelling of 1897236720 in words is "one billion, eight hundred ninety-seven million, two hundred thirty-six thousand, seven hundred twenty".