540993978 has 80 divisors (see below), whose sum is σ = 1390202880. Its totient is φ = 154034784.

The previous prime is 540993953. The next prime is 540993997. The reversal of 540993978 is 879399045.

540993978 is a `hidden beast` number, since 540 + 9 + 9 + 3 + 97 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 422343 + ... + 423621.

It is an arithmetic number, because the mean of its divisors is an integer number (17377536).

Almost surely, 2^540993978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 540993978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (695101440).

540993978 is an abundant number, since it is smaller than the sum of its proper divisors (849208902).

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

540993978 is a wasteful number, since it uses less digits than its factorization.

540993978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673 (or 1664 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 540993978 is about 23259.2772458647. The cubic root of 540993978 is about 814.8246215781.

The spelling of 540993978 in words is "five hundred forty million, nine hundred ninety-three thousand, nine hundred seventy-eight".