1271420990 has 64 divisors (see below), whose sum is σ = 2833864704. Its totient is φ = 400716288.

The previous prime is 1271420989. The next prime is 1271421037. The reversal of 1271420990 is 990241721.

It is a super-2 number, since 2×1271420990² = 3233022667625160200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1271420990.

It is a congruent number.

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, 38747 + ... + 63593.

It is an arithmetic number, because the mean of its divisors is an integer number (44279136).

Almost surely, 2^1271420990 is an apocalyptic number.

1271420990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1271420990 is an abundant number, since it is smaller than the sum of its proper divisors (1562443714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1271420990 is a wasteful number, since it uses less digits than its factorization.

1271420990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24921.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1271420990 is about 35656.9907591765. The cubic root of 1271420990 is about 1083.3358761808.

The spelling of 1271420990 in words is "one billion, two hundred seventy-one million, four hundred twenty thousand, nine hundred ninety".