1540421357 has 8 divisors (see below), whose sum is σ = 1641425976. Its totient is φ = 1440571392.

The previous prime is 1540421347. The next prime is 1540421359. The reversal of 1540421357 is 7531240451.

It can be written as a sum of positive squares in 4 ways, for example, as 276689956 + 1263731401 = 16634^2 + 35549^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1540421357 - 2¹⁰ = 1540420333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540421359) 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, 285908 + ... + 291245.

It is an arithmetic number, because the mean of its divisors is an integer number (205178247).

Almost surely, 2^1540421357 is an apocalyptic number.

1540421357 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1540421357 is a deficient number, since it is larger than the sum of its proper divisors (101004619).

1540421357 is a wasteful number, since it uses less digits than its factorization.

1540421357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577327.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 1540421357 is about 39248.2019588159. The cubic root of 1540421357 is about 1154.9056617288.

The spelling of 1540421357 in words is "one billion, five hundred forty million, four hundred twenty-one thousand, three hundred fifty-seven".