1540457387 has 4 divisors (see below), whose sum is σ = 1760522736. Its totient is φ = 1320392040.

The previous prime is 1540457381. The next prime is 1540457423. The reversal of 1540457387 is 7837540451.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1540457387 - 2⁶ = 1540457323 is a prime.

It is a super-2 number, since 2×1540457387² = 4746017922325735538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1540457381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110032664 + ... + 110032677.

It is an arithmetic number, because the mean of its divisors is an integer number (440130684).

Almost surely, 2^1540457387 is an apocalyptic number.

1540457387 is a deficient number, since it is larger than the sum of its proper divisors (220065349).

1540457387 is an equidigital number, since it uses as much as digits as its factorization.

1540457387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220065348.

The product of its (nonzero) digits is 470400, while the sum is 44.

The square root of 1540457387 is about 39248.6609580505. The cubic root of 1540457387 is about 1154.9146659592.

The spelling of 1540457387 in words is "one billion, five hundred forty million, four hundred fifty-seven thousand, three hundred eighty-seven".