1240991401 has 8 divisors (see below), whose sum is σ = 1339345280. Its totient is φ = 1143050832.

The previous prime is 1240991399. The next prime is 1240991407. The reversal of 1240991401 is 1041990421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1240991401 - 2¹ = 1240991399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240991407) 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, 97071 + ... + 109108.

It is an arithmetic number, because the mean of its divisors is an integer number (167418160).

Almost surely, 2^1240991401 is an apocalyptic number.

It is an amenable number.

1240991401 is a deficient number, since it is larger than the sum of its proper divisors (98353879).

1240991401 is a wasteful number, since it uses less digits than its factorization.

1240991401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206655.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1240991401 is about 35227.7078590135. The cubic root of 1240991401 is about 1074.6233116120.

The spelling of 1240991401 in words is "one billion, two hundred forty million, nine hundred ninety-one thousand, four hundred one".