1494615978 has 48 divisors (see below), whose sum is σ = 3383289000. Its totient is φ = 476246400.

The previous prime is 1494615919. The next prime is 1494616001. The reversal of 1494615978 is 8795164941.

1494615978 is a `hidden beast` number, since 1 + 4 + 9 + 46 + 1 + 597 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1285437609 + 209178369 = 35853^2 + 14463^2 .

It is a Curzon number.

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, 38548 + ... + 66896.

Almost surely, 2^1494615978 is an apocalyptic number.

1494615978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1494615978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1691644500).

1494615978 is an abundant number, since it is smaller than the sum of its proper divisors (1888673022).

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

1494615978 is a wasteful number, since it uses less digits than its factorization.

1494615978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28487 (or 28484 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 1494615978 is about 38660.2635531627. The cubic root of 1494615978 is about 1143.3430080374.

The spelling of 1494615978 in words is "one billion, four hundred ninety-four million, six hundred fifteen thousand, nine hundred seventy-eight".