1400873621 has 4 divisors (see below), whose sum is σ = 1600998432. Its totient is φ = 1200748812.

The previous prime is 1400873603. The next prime is 1400873641. The reversal of 1400873621 is 1263780041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1263780041 = 19 ⋅66514739.

It is a cyclic number.

It is not a de Polignac number, because 1400873621 - 2⁶ = 1400873557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400873641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100062395 + ... + 100062408.

It is an arithmetic number, because the mean of its divisors is an integer number (400249608).

Almost surely, 2^1400873621 is an apocalyptic number.

It is an amenable number.

1400873621 is a deficient number, since it is larger than the sum of its proper divisors (200124811).

1400873621 is an equidigital number, since it uses as much as digits as its factorization.

1400873621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200124810.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 1400873621 is about 37428.2462987514. The cubic root of 1400873621 is about 1118.9215865903.

The spelling of 1400873621 in words is "one billion, four hundred million, eight hundred seventy-three thousand, six hundred twenty-one".