1521942740 has 24 divisors (see below), whose sum is σ = 3227728392. Its totient is φ = 602748800.

The previous prime is 1521942739. The next prime is 1521942749. The reversal of 1521942740 is 472491251.

It can be written as a sum of positive squares in 4 ways, for example, as 991746064 + 530196676 = 31492^2 + 23026^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1521942740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521942749) 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, 374699 + ... + 378738.

It is an arithmetic number, because the mean of its divisors is an integer number (134488683).

Almost surely, 2^1521942740 is an apocalyptic number.

1521942740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521942740 is an abundant number, since it is smaller than the sum of its proper divisors (1705785652).

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

1521942740 is a wasteful number, since it uses less digits than its factorization.

1521942740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753547 (or 753545 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1521942740 is about 39012.0845379992. The cubic root of 1521942740 is about 1150.2690586581.

The spelling of 1521942740 in words is "one billion, five hundred twenty-one million, nine hundred forty-two thousand, seven hundred forty".