1542440 has 16 divisors (see below), whose sum is σ = 3470580. Its totient is φ = 616960.

The previous prime is 1542433. The next prime is 1542451. The reversal of 1542440 is 442451.

It can be written as a sum of positive squares in 2 ways, for example, as 1473796 + 68644 = 1214^2 + 262^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19241 + ... + 19320.

2^1542440 is an apocalyptic number.

1542440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1542440 is an abundant number, since it is smaller than the sum of its proper divisors (1928140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1542440 is a wasteful number, since it uses less digits than its factorization.

1542440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38572 (or 38568 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1542440 is about 1241.9500795121. The cubic root of 1542440 is about 115.5409923023.

Adding to 1542440 its reverse (442451), we get a palindrome (1984891).

The spelling of 1542440 in words is "one million, five hundred forty-two thousand, four hundred forty".