1421785157 has 16 divisors (see below), whose sum is σ = 1643448240. Its totient is φ = 1218281472.

The previous prime is 1421785129. The next prime is 1421785159. The reversal of 1421785157 is 7515871241.

It can be written as a sum of positive squares in 8 ways, for example, as 35414401 + 1386370756 = 5951^2 + 37234^2 .

It is not a de Polignac number, because 1421785157 - 2⁶ = 1421785093 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 (1421785159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27932 + ... + 60197.

It is an arithmetic number, because the mean of its divisors is an integer number (102715515).

Almost surely, 2^1421785157 is an apocalyptic number.

1421785157 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1421785157 is a deficient number, since it is larger than the sum of its proper divisors (221663083).

1421785157 is a wasteful number, since it uses less digits than its factorization.

1421785157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88232.

The product of its digits is 78400, while the sum is 41.

The square root of 1421785157 is about 37706.5664970970. The cubic root of 1421785157 is about 1124.4616768022.

The spelling of 1421785157 in words is "one billion, four hundred twenty-one million, seven hundred eighty-five thousand, one hundred fifty-seven".