1542742257 has 32 divisors (see below), whose sum is σ = 2389012480. Its totient is φ = 867335040.

The previous prime is 1542742217. The next prime is 1542742309. The reversal of 1542742257 is 7522472451.

It is a happy number.

It is not a de Polignac number, because 1542742257 - 2²² = 1538547953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1542742217) 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 31 ways as a sum of consecutive naturals, for example, 517782 + ... + 520752.

It is an arithmetic number, because the mean of its divisors is an integer number (74656640).

Almost surely, 2^1542742257 is an apocalyptic number.

It is an amenable number.

1542742257 is a deficient number, since it is larger than the sum of its proper divisors (846270223).

1542742257 is a wasteful number, since it uses less digits than its factorization.

1542742257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373.

The product of its digits is 156800, while the sum is 39.

The square root of 1542742257 is about 39277.7577898739. The cubic root of 1542742257 is about 1155.4853895844.

The spelling of 1542742257 in words is "one billion, five hundred forty-two million, seven hundred forty-two thousand, two hundred fifty-seven".