1621450426 has 8 divisors (see below), whose sum is σ = 2438303220. Its totient is φ = 808682688.

The previous prime is 1621450423. The next prime is 1621450427. The reversal of 1621450426 is 6240541261.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1536718401 + 84732025 = 39201^2 + 9205^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1621450423) 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, 1020271 + ... + 1021858.

Almost surely, 2^1621450426 is an apocalyptic number.

1621450426 is a deficient number, since it is larger than the sum of its proper divisors (816852794).

1621450426 is a wasteful number, since it uses less digits than its factorization.

1621450426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042528.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1621450426 is about 40267.2376256430. The cubic root of 1621450426 is about 1174.8106955628.

Adding to 1621450426 its reverse (6240541261), we get a palindrome (7861991687).

The spelling of 1621450426 in words is "one billion, six hundred twenty-one million, four hundred fifty thousand, four hundred twenty-six".