1263155940 has 36 divisors (see below), whose sum is σ = 3831573564. Its totient is φ = 336841536.

The previous prime is 1263155939. The next prime is 1263155953. The reversal of 1263155940 is 495513621.

1263155940 is a `hidden beast` number, since 1 + 2 + 63 + 1 + 5 + 594 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 227346084 + 1035809856 = 15078^2 + 32184^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1263155895 and 1263155904.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3508587 + ... + 3508946.

It is an arithmetic number, because the mean of its divisors is an integer number (106432599).

Almost surely, 2^1263155940 is an apocalyptic number.

1263155940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263155940 is an abundant number, since it is smaller than the sum of its proper divisors (2568417624).

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

1263155940 is a wasteful number, since it uses less digits than its factorization.

1263155940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7017548 (or 7017543 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 1263155940 is about 35540.9051657383. The cubic root of 1263155940 is about 1080.9833122667.

The spelling of 1263155940 in words is "one billion, two hundred sixty-three million, one hundred fifty-five thousand, nine hundred forty".