1265016420 has 48 divisors (see below), whose sum is σ = 3935608320. Its totient is φ = 337337568.

The previous prime is 1265016413. The next prime is 1265016433. The reversal of 1265016420 is 246105621.

1265016420 is a `hidden beast` number, since 1 + 2 + 650 + 1 + 6 + 4 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1170772 + ... + 1171851.

It is an arithmetic number, because the mean of its divisors is an integer number (81991840).

Almost surely, 2^1265016420 is an apocalyptic number.

1265016420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265016420 is an abundant number, since it is smaller than the sum of its proper divisors (2670591900).

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

1265016420 is a wasteful number, since it uses less digits than its factorization.

1265016420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2342641 (or 2342633 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1265016420 is about 35567.0693198076. The cubic root of 1265016420 is about 1081.5137723050.

The spelling of 1265016420 in words is "one billion, two hundred sixty-five million, sixteen thousand, four hundred twenty".