1540157385 has 32 divisors (see below), whose sum is σ = 2793490560. Its totient is φ = 718322688.

The previous prime is 1540157357. The next prime is 1540157419. The reversal of 1540157385 is 5837510451.

It is not a de Polignac number, because 1540157385 - 2¹⁵ = 1540124617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204144 + ... + 211553.

It is an arithmetic number, because the mean of its divisors is an integer number (87296580).

Almost surely, 2^1540157385 is an apocalyptic number.

1540157385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1540157385 is a deficient number, since it is larger than the sum of its proper divisors (1253333175).

1540157385 is a wasteful number, since it uses less digits than its factorization.

1540157385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415737.

The product of its (nonzero) digits is 84000, while the sum is 39.

The square root of 1540157385 is about 39244.8389600467. The cubic root of 1540157385 is about 1154.8396884002.

The spelling of 1540157385 in words is "one billion, five hundred forty million, one hundred fifty-seven thousand, three hundred eighty-five".