1240651 has 6 divisors (see below), whose sum is σ = 1282956. Its totient is φ = 1199700.

The previous prime is 1240637. The next prime is 1240667. The reversal of 1240651 is 1560421.

It is not a de Polignac number, because 1240651 - 2⁷ = 1240523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 316 + ... + 1606.

It is an arithmetic number, because the mean of its divisors is an integer number (213826).

2^1240651 is an apocalyptic number.

1240651 is a deficient number, since it is larger than the sum of its proper divisors (42305).

1240651 is an equidigital number, since it uses as much as digits as its factorization.

1240651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1240651 is about 1113.8451418397. The cubic root of 1240651 is about 107.4525047084.

It can be divided in two parts, 1240 and 651, that added together give a triangular number (1891 = T₆₁).

The spelling of 1240651 in words is "one million, two hundred forty thousand, six hundred fifty-one".