1542978940 has 24 divisors (see below), whose sum is σ = 3263913072. Its totient is φ = 612685440.

The previous prime is 1542978929. The next prime is 1542978947. The reversal of 1542978940 is 498792451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1542978947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278826 + ... + 284305.

It is an arithmetic number, because the mean of its divisors is an integer number (135996378).

Almost surely, 2^1542978940 is an apocalyptic number.

1542978940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1542978940 is an abundant number, since it is smaller than the sum of its proper divisors (1720934132).

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

1542978940 is a wasteful number, since it uses less digits than its factorization.

1542978940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563277 (or 563275 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 1542978940 is about 39280.7706136221. The cubic root of 1542978940 is about 1155.5444769579.

The spelling of 1542978940 in words is "one billion, five hundred forty-two million, nine hundred seventy-eight thousand, nine hundred forty".