921985738 has 4 divisors (see below), whose sum is σ = 1382978610. Its totient is φ = 460992868.

The previous prime is 921985733. The next prime is 921985741. The reversal of 921985738 is 837589129.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 764909649 + 157076089 = 27657^2 + 12533^2 .

It is not an unprimeable number, because it can be changed into a prime (921985733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230496433 + ... + 230496436.

Almost surely, 2^921985738 is an apocalyptic number.

921985738 is a deficient number, since it is larger than the sum of its proper divisors (460992872).

921985738 is a wasteful number, since it uses less digits than its factorization.

921985738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460992871.

The product of its digits is 1088640, while the sum is 52.

The square root of 921985738 is about 30364.2180534918. The cubic root of 921985738 is about 973.2880721379.

The spelling of 921985738 in words is "nine hundred twenty-one million, nine hundred eighty-five thousand, seven hundred thirty-eight".