21960738 has 12 divisors (see below), whose sum is σ = 47581638. Its totient is φ = 7320240.

The previous prime is 21960727. The next prime is 21960767. The reversal of 21960738 is 83706912.

21960738 is a `hidden beast` number, since 2 + 19 + 607 + 38 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11675889 + 10284849 = 3417^2 + 3207^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 610003 + ... + 610038.

Almost surely, 2^21960738 is an apocalyptic number.

21960738 is an abundant number, since it is smaller than the sum of its proper divisors (25620900).

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

21960738 is a wasteful number, since it uses less digits than its factorization.

21960738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220049 (or 1220046 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21960738 is about 4686.2285475636. The cubic root of 21960738 is about 280.0371464323.

The spelling of 21960738 in words is "twenty-one million, nine hundred sixty thousand, seven hundred thirty-eight".