1400020251 has 16 divisors (see below), whose sum is σ = 2134884864. Its totient is φ = 799441344.

The previous prime is 1400020249. The next prime is 1400020267. The reversal of 1400020251 is 1520200041.

It is not a de Polignac number, because 1400020251 - 2¹ = 1400020249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1400020251.

It is not an unprimeable number, because it can be changed into a prime (1400020201) 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 15 ways as a sum of consecutive naturals, for example, 7351 + ... + 53423.

It is an arithmetic number, because the mean of its divisors is an integer number (133430304).

Almost surely, 2^1400020251 is an apocalyptic number.

1400020251 is a deficient number, since it is larger than the sum of its proper divisors (734864613).

1400020251 is a wasteful number, since it uses less digits than its factorization.

1400020251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47530.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1400020251 is about 37416.8444821313. The cubic root of 1400020251 is about 1118.6943360006.

Adding to 1400020251 its reverse (1520200041), we get a palindrome (2920220292).

The spelling of 1400020251 in words is "one billion, four hundred million, twenty thousand, two hundred fifty-one".