1400021437 has 2 divisors, whose sum is σ = 1400021438. Its totient is φ = 1400021436.

The previous prime is 1400021377. The next prime is 1400021449. The reversal of 1400021437 is 7341200041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1251815161 + 148206276 = 35381^2 + 12174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1400021437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1400021237) 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 as a sum of consecutive naturals, namely, 700010718 + 700010719.

It is an arithmetic number, because the mean of its divisors is an integer number (700010719).

Almost surely, 2^1400021437 is an apocalyptic number.

It is an amenable number.

1400021437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400021437 is an equidigital number, since it uses as much as digits as its factorization.

1400021437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1400021437 is about 37416.8603306050. The cubic root of 1400021437 is about 1118.6946518939.

Adding to 1400021437 its reverse (7341200041), we get a palindrome (8741221478).

The spelling of 1400021437 in words is "one billion, four hundred million, twenty-one thousand, four hundred thirty-seven".