263972394 has 48 divisors (see below), whose sum is σ = 656809920. Its totient is φ = 75055680.

The previous prime is 263972389. The next prime is 263972411. The reversal of 263972394 is 493279362.

263972394 is a `hidden beast` number, since 2 + 639 + 7 + 2 + 3 + 9 + 4 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21622 + ... + 31550.

It is an arithmetic number, because the mean of its divisors is an integer number (13683540).

Almost surely, 2^263972394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263972394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328404960).

263972394 is an abundant number, since it is smaller than the sum of its proper divisors (392837526).

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

263972394 is a wasteful number, since it uses less digits than its factorization.

263972394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10155 (or 10152 counting only the distinct ones).

The product of its digits is 489888, while the sum is 45.

The square root of 263972394 is about 16247.2272711377. The cubic root of 263972394 is about 641.4845048175.

The spelling of 263972394 in words is "two hundred sixty-three million, nine hundred seventy-two thousand, three hundred ninety-four".