127821490 has 16 divisors (see below), whose sum is σ = 230373720. Its totient is φ = 51063040.

The previous prime is 127821443. The next prime is 127821497. The reversal of 127821490 is 94128721.

It can be written as a sum of positive squares in 4 ways, for example, as 81595089 + 46226401 = 9033^2 + 6799^2 .

It is not an unprimeable number, because it can be changed into a prime (127821497) 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, 426 + ... + 15994.

Almost surely, 2^127821490 is an apocalyptic number.

127821490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

127821490 is a deficient number, since it is larger than the sum of its proper divisors (102552230).

127821490 is a wasteful number, since it uses less digits than its factorization.

127821490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16397.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 127821490 is about 11305.8166445419. The cubic root of 127821490 is about 503.7340312695.

The spelling of 127821490 in words is "one hundred twenty-seven million, eight hundred twenty-one thousand, four hundred ninety".