1400121309 has 16 divisors (see below), whose sum is σ = 1978058880. Its totient is φ = 877877760.

The previous prime is 1400121269. The next prime is 1400121367. The reversal of 1400121309 is 9031210041.

It is not a de Polignac number, because 1400121309 - 2¹¹ = 1400119261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400121209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67977 + ... + 86145.

It is an arithmetic number, because the mean of its divisors is an integer number (123628680).

Almost surely, 2^1400121309 is an apocalyptic number.

It is an amenable number.

1400121309 is a deficient number, since it is larger than the sum of its proper divisors (577937571).

1400121309 is a wasteful number, since it uses less digits than its factorization.

1400121309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19700.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1400121309 is about 37418.1948923248. The cubic root of 1400121309 is about 1118.7212523475.

The spelling of 1400121309 in words is "one billion, four hundred million, one hundred twenty-one thousand, three hundred nine".