921997734 has 64 divisors (see below), whose sum is σ = 2203960320. Its totient is φ = 251412480.

The previous prime is 921997733. The next prime is 921997759. The reversal of 921997734 is 437799129.

It is a super-2 number, since 2×921997734² = 1700159643002269512, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921997733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 618462 + ... + 619950.

It is an arithmetic number, because the mean of its divisors is an integer number (34436880).

Almost surely, 2^921997734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921997734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1101980160).

921997734 is an abundant number, since it is smaller than the sum of its proper divisors (1281962586).

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

921997734 is a wasteful number, since it uses less digits than its factorization.

921997734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165.

The product of its digits is 857304, while the sum is 51.

The square root of 921997734 is about 30364.4155879872. The cubic root of 921997734 is about 973.2922932853.

It can be divided in two parts, 9219 and 97734, that added together give a triangular number (106953 = T₄₆₂).

The spelling of 921997734 in words is "nine hundred twenty-one million, nine hundred ninety-seven thousand, seven hundred thirty-four".