1401665250 has 64 divisors (see below), whose sum is σ = 3504189312. Its totient is φ = 373176000.

The previous prime is 1401665231. The next prime is 1401665257. The reversal of 1401665250 is 525661041.

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

It is not an unprimeable number, because it can be changed into a prime (1401665257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 656685 + ... + 658815.

It is an arithmetic number, because the mean of its divisors is an integer number (54752958).

Almost surely, 2^1401665250 is an apocalyptic number.

1401665250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1401665250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1752094656).

1401665250 is an abundant number, since it is smaller than the sum of its proper divisors (2102524062).

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

1401665250 is a wasteful number, since it uses less digits than its factorization.

1401665250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028 (or 3018 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1401665250 is about 37438.8200935874. The cubic root of 1401665250 is about 1119.1323131843.

The spelling of 1401665250 in words is "one billion, four hundred one million, six hundred sixty-five thousand, two hundred fifty".