1261514640 has 40 divisors (see below), whose sum is σ = 3910696128. Its totient is φ = 336403840.

The previous prime is 1261514629. The next prime is 1261514647. The reversal of 1261514640 is 464151621.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1261514598 and 1261514607.

It is not an unprimeable number, because it can be changed into a prime (1261514647) 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, 2627916 + ... + 2628395.

Almost surely, 2^1261514640 is an apocalyptic number.

1261514640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261514640 is an abundant number, since it is smaller than the sum of its proper divisors (2649181488).

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

1261514640 is a wasteful number, since it uses less digits than its factorization.

1261514640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5256327 (or 5256321 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1261514640 is about 35517.8073647572. The cubic root of 1261514640 is about 1080.5149122163.

The spelling of 1261514640 in words is "one billion, two hundred sixty-one million, five hundred fourteen thousand, six hundred forty".