1541978140 has 24 divisors (see below), whose sum is σ = 3349815840. Its totient is φ = 595522368.

The previous prime is 1541978129. The next prime is 1541978257. The reversal of 1541978140 is 418791451.

It is a junction number, because it is equal to n+sod(n) for n = 1541978093 and 1541978102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328712 + ... + 1329871.

It is an arithmetic number, because the mean of its divisors is an integer number (139575660).

Almost surely, 2^1541978140 is an apocalyptic number.

1541978140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1541978140 is an abundant number, since it is smaller than the sum of its proper divisors (1807837700).

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

1541978140 is a wasteful number, since it uses less digits than its factorization.

1541978140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2658621 (or 2658619 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 1541978140 is about 39268.0294896497. The cubic root of 1541978140 is about 1155.2945882508.

The spelling of 1541978140 in words is "one billion, five hundred forty-one million, nine hundred seventy-eight thousand, one hundred forty".